How We're Redefining the kg

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Күн бұрын

In 2018 the kg will be defined by Planck's constant, not a hunk of metal.
Try a free book from Audible for 30 days ve42.co/audible
Special thanks to the staff at NIST who made this possible: Darine Haddad, Jon Pratt, Stephan Schlamminger, and Ben Stein.
Additional footage and animations by Sean Kelley, Jennifer Lauren Lee, and Frank Seifert.
I have been obsessed with measurement for a long time and I'm not sure quite how it happened. The world's roundest object played a role in this. I guess I'm just fascinated by how difficult it is to pin down a quantity like a kilogram. A physical object seemed like a good idea until the mass of the international prototype kilogram wasn't as constant as expected. These methods of the Kibble balance and silicon sphere have shown better precision than 20 parts per billion, making them superior to the old method. The agreement between Avogadro approaches
Special thanks to Patreon Supporters:
Tony Fadell, Donal Botkin, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen
Support Veritasium on Patreon: ve42.co/patreon
Interferometer video by TSG Physics: • Michelson Interferometer
Music from epidemicsound.com "ExperiMental1" by Gunnar Johnsén
Studio filming by Raquel Nuno

Пікірлер: 4 900

@1lamafarmer 3 жыл бұрын

It's a good thing they went with the Plank's Constant in the end. I've weighed loads of avocados and none of them were close to a kilogram.

@andersjjensen 3 жыл бұрын

Ba-dum-tsss! :P

@xGOKOPx 3 жыл бұрын

I hope the plank they've chosen weighs a kilogram tho

@philipptielmann 2 жыл бұрын

and the avocados also weigh differently and change their mass a lot over time!

@MinhiNug 2 жыл бұрын

You need to use Avocado’s number

@gallium-gonzollium 2 жыл бұрын

@@MinhiNug or Plank’s constant

@smartereveryday 7 жыл бұрын

I appreciated the giggle at the end. The guy basically said "solve this simple algebra equation and redefine the two fundamental units of ALL OF PHYSICS".

@odin_3 5 жыл бұрын

Hello

@DustyyBoi 5 жыл бұрын

@@odin_3 Yes

@kumarsrijan8377 5 жыл бұрын

@Mukund Ranjan Tiwari yes you may want to learn about what the founder of wolfram alpha has to say about it. Look for his ted talk

@mikaylamerna62 5 жыл бұрын

Like what my physics teacher used to say the physics equations are simple math...

@camplethargic8 4 жыл бұрын

I'm pretty sure I had this guy for high school physics 8:23 - mumble mutter something-or-other (very fast and in a difficult to understand accent), "simple -don't you see, dummkoff?" 🤔

@Zorgongola 6 жыл бұрын

Hey Veritasium I was part of the team working with Bryan Kibble on the NPL mkII Kibble Balance (aka Watt Balance, aka Moving Coil experiment) between 1991 and 2000. Firstly I'd like to congratulate you on a great video. It's not easy explaining this elegant but complex method of redefining the kg and you guys did a good job. One thing to possibly add is the importance of keeping the magnetic field constant. Both weighing and velocity measurements are not quick and are conducted over a long time period. Back then it lasted over an hour, and the field strength is highly susceptible to temperature changes, so keeping the large magnet at a constant temperature is imperative. I worked on the NPL system and we managed to keep the temperature drift down to a millikelvin or two over the duration of measurement, usually overnight.

@idjles 5 жыл бұрын

How do you measure g without knowing what a kg is? this seems circular.

@raymondo737 5 жыл бұрын

If I understand your question correctly, I think you are mistaken. The "g" in the equation is g as in "Gravitational acceleration", not g as in "gram". It's measured in m/s^2. The video at 7:31 explains how they determine the local value of g with very high accuracy.

@raymondo737 5 жыл бұрын

Hello Robin, My mind boggles at how we've improved accuracy from measuring in sticks, stones and body parts to tiny fractions of fundamental constants. Also, I find it poetic that we use equipment that needs a crane to lift and assemble to perform measurements so sensitive, that would be affected by the operator's kids changing the TV channel at home.

@andrewm9425 4 жыл бұрын

@@idjles you measure the free-fall acceleration due to gravity. they do that by dropping a reflecting cube down an evacuated pipe and using a laser to measure the acceleration.

@braveecologic2030 4 жыл бұрын

I agree from an external perspective too

@smortboi1320 3 жыл бұрын

No one: Bryan Kibble: “I want to weigh myself with *electricity”*

@donottrustanyonelol 3 жыл бұрын

i understood none of what Ver just said but *yes yes yes yes*

@thehouseofcha1nsaw_ 2 жыл бұрын

Isnt that how most scales work anyway? I think Kibble was thinking more like "bro, gravity be lackin"

@trun_k 7 жыл бұрын

One Balance to rule them all, one balance to define them. One balance to standardise them all, and into light forever bind them.

@rydaddy2867 7 жыл бұрын

That's beautiful...needs to be on a sticker stuck to the side of the Kibble Balance.

@pizzamannetje79 7 жыл бұрын

RyDaddy i agree, perhaps with "into the light" replaced by "into Planck"

@Theraot 7 жыл бұрын

Oh no, the sticker is gonna screw the measurement

@fadyel7946 7 жыл бұрын

lol

@khadija7530 7 жыл бұрын

Ash nazg durbatulûk, ash nazg gimbatul, ash nazg thrakatulûk, agh burzum-ishi krimpatul.

@smartereveryday 7 жыл бұрын

Another thing.. I thought the fact that you've locally mapped g in the room was FASCINATING.

@veritasium 7 жыл бұрын

+SmarterEveryDay yeah, I thought that was fascinating- not only did they have to map it, they then had to calculate what it would be at the center of mass including the influence of the balance itself

@kuroshite 5 жыл бұрын

Hi Mr. Potato

@chuckborris804 5 жыл бұрын

How crazy is that?!! That's an insane amount of precision. Just mind-blowing.

@moos5221 4 жыл бұрын

@@chuckborris804 Imagine doing that for the USA measurements like cups, tablespoons and handfulls.

@edydaou 4 жыл бұрын

Well, the 2 most channels I watch are here @SmarterEveryDay and @Veritasium. when are you doing an episode together?

@yuvneesh 5 жыл бұрын

Watching this on May 20, 2019. SI units have been officially redefined today, kg is defined by Planck’s constant.

@bhupendrasingh8242 5 жыл бұрын

You know what I hate Plank's Constant

@elendilion 4 жыл бұрын

@@bhupendrasingh8242 and the Planck's constant hates you.

@Milesco 4 жыл бұрын

@@elendilion : That's right. A team of scientists from the National Institute of Standards & Technology went to a local Home Depot and took a random Planck of wood off the shelf and measured the weight, divided that weight by Planck's constant, and that became the basis of the new kilogram.

@makc3887 5 жыл бұрын

The official day has come.... Today kilogram definition is changed

@JamBos11 5 жыл бұрын

the kilogram is now the energy of a gamma-ray photon which does not exist, which cannot be produced, and which is completely 100% fictional and has a wavelength which is approximately a million times smaller than the width of a quark. What does that say about the level of scientific development...? Not something science should be proud of.

@eggue9598 5 жыл бұрын

@@JamBos11 Explain?

@JamBos11 5 жыл бұрын

@@eggue9598 the kilogram's redefinition equates the mass of 1kg to the energy of a gamma ray which is so energetic that has a wave length a million times smaller than the smallest matter particle present day physics has concieved - the quark. this gamma ray photon is so energetic that radiation of photons with that same frequency can never be produced on Earth. it is a fictional photon, that humans cannot experiemce, produce, interact with, etc.

@eggue9598 5 жыл бұрын

@@JamBos11 just because humans can't intact with it doesn't mean it does not exist

@JamBos11 5 жыл бұрын

@Eggue, but it does mean that it doesn't exist for humans because humans cannot produce it (too much energy - 20 Mtons of TNT equivalent per photon) or measure it (no equipment to measure such radiation), and if humans were unlucky enough that the planet gets exposed to radiation of such photons passing by, each photon from that radiation will deliver a blow over 1000 times larger than Heroshima.

@fizizy6415 7 жыл бұрын

5:00 Yes, I can definitely see why they call it the "Watt", because that's what everyone says after you explain it to them.

@N3G4T3 7 жыл бұрын

Fizizy Or if you go back to school and study physics it'll make sense.

@msolec2000 7 жыл бұрын

I only know that Watt's on second. :P

@noname-sg6qx 7 жыл бұрын

VI=P, P= power, unit for power is watt

@NikhilTawde 7 жыл бұрын

nice one

@lachlansutcliffe4308 7 жыл бұрын

Fizizy ahahahha lol good one

@conure512 7 жыл бұрын

R.I.P. the 1-kg mass in France. You'll be remembered.

@toucaninterieur8011 7 жыл бұрын

#dicksoutforthekilogram

@rojirrim7298 7 жыл бұрын

Parrot-hD Actually those cylinders will probably still be used. They won't be used as a definition anymore, but as a pattern. You can't have a Watt Balance on every laboratory, what they do is send their instruments to a place where these will be calibrated, and for the calibration they will probably still use the cylinders because of sheer convenience.

@mkb6418 7 жыл бұрын

Well it was time. All other constants are constant, it is time for kilo

@danilooliveira6580 7 жыл бұрын

Gabriel, actually they will most likely make new weights instead of changing the ones they already have. the mass in France will probably end up in a museum

@pizzamandhx 7 жыл бұрын

But they'll be remembered as they should be: in a museum, for the value they contributed to humanity. The prototype kilograms helped put people into space, make metal ships that can float in our oceans, helped us determine Planck's Constant. They have been immensely useful. We're graduating to something better, moving on as a species. Aren't all of these good things?

@shadowfall2011 3 жыл бұрын

Your videos are beautifully made, entertaining, and wholesome. Thank you! You can see the labor of love that goes into them.

@avici0182 6 жыл бұрын

Watt?

@falsonaga 5 жыл бұрын

Volt you don't understand

@sideoutside 5 жыл бұрын

Cause.

@billyjoejimbob75 4 жыл бұрын

That joke was lame, scAmpere off.

@AnhThuNguyen-zz2hm 4 жыл бұрын

I Resist the urge to laugh.

@darwinvironomy3538 3 жыл бұрын

@@AnhThuNguyen-zz2hm Watt? i thought it's MASSive object with GRAVITional acceleration in a VELocity.

@Tool8x 7 жыл бұрын

The kg is dead, long live the kg! All hail the kg!

@gnochhuos645 7 жыл бұрын

SEIZE THE MEANS OF MASS

@woodzy136 7 жыл бұрын

First the weight, then the height, then THE WORLD

@danielw832 7 жыл бұрын

Vietnam Mapper By any Mass Necessary

@MrtinVarela 7 жыл бұрын

You could say it was... mass murder

@cheat200 7 жыл бұрын

WE MUST MASS IMMEDIATELY AND STOP THIS MASS GENOCIDE!

@harshachoudhary7847 7 жыл бұрын

''Derek changing the world, one kilogram at a time''

@JellybellyWaffles 7 жыл бұрын

One kilogram at a time? How long would that take?

@agioiutdrdgfyfyfhgky 7 жыл бұрын

JellybellyWaffles that depends on the rate at which the kilograms are being changed.

@nikhildrogbacena 7 жыл бұрын

JellybellyWaffles well, assuming time here means a single moment (1 second (give or take)), it would take 10^24s to change it entirely.

@paletreker 7 жыл бұрын

+JellybellyWaffles ask vsauce

@SidekickTrail 7 жыл бұрын

Braden Krause well time in the S.I(international system)is set as 1 second(s) so one can only guess a second

@schroeder1112 4 жыл бұрын

I am quite happy i don´t have to learn this definition in physics class and could stick with the old definition. So this new definition alone could be enough for a single exam.

@salimbouhezza5473 5 жыл бұрын

my head after 35 seconds: INTERNAL SERVER ERROR 500 NO BRAIN CONNECTION DETECTED

@AnhThuNguyen-zz2hm 4 жыл бұрын

Me: huh Most people: *INTERNAL SERVER ERROR 69* *INVALID FORMAT*

@James__123 7 жыл бұрын

4 years of my physics degree later and I'm still like "ah yes I know some of those words"

@emgb1 7 жыл бұрын

4 years of your physics degree later and you can start again at the beginning because all your calculations are now false.

@JohannaMueller57 7 жыл бұрын

wait, 8 semesters of physics only last for knowing some of those words? :-o

@AlqGo 6 жыл бұрын

University nowadays = all about degree certificates. Genuinely skilled graduates are those who invested countless hours teaching themselves cause Uni courses are typically not great in imparting knowledge that lasts long in the brain.

@youssefmousa2830 6 жыл бұрын

because that is algebra not physics

@chrisdock8804 6 жыл бұрын

... You should really know most of this stuff. Maybe not Josephson Junctions or Quantum Hall but hopefully you would have seen those in a Lab. Everything else is first year stuff though? If that.

@hassanallama9376 7 жыл бұрын

drugs dealers are going back to school because of this

@SpydersByte 5 жыл бұрын

best comment

@dirtyp4670 5 жыл бұрын

One meter of skunk please.

@Chunkboi 5 жыл бұрын

“Could I get 28.35g of weed?”

@its_kamau 5 жыл бұрын

hahaha they better go back to school or business is over

@omhekde9033 5 жыл бұрын

Its true now! Commented on 16 Nov 2018

@arijitpalit2756 5 жыл бұрын

Wooo hoooo

@inpinksuit 3 жыл бұрын

@allejandrodavid5222 Ай бұрын

5 years ago

@LonDiffenderfer 2 жыл бұрын

Although I understand the need to change the method of defining the kilogram (thanks to you), I still have no idea how it is done. Those calculations are still currently beyond my abilities to comprehend. I often have difficulty grasping all of what is said in your videos, but I still appreciate that you produce them for our benefit. Thank you for your time, effort, and desire to educate us. :) Very best to you and yours!

@naufalmEZa 2 жыл бұрын

The fact that you watched this still, is heartwarming.. Really, you gotta see where you're lacking to start learning.

@pyropulseIXXI Жыл бұрын

You should read some books; this is at basic algebra level, which is 6th grade level, I would say. Our education system does a good job in making easy things seem hard, by not properly teaching them. For instance, I learned calculus at 13 on my own, just from reading a textbook. And yet, they don't teach proper calculus until college. Therefore, the system is stunted by at least 6 years

@jimmysyar889 Жыл бұрын

@@pyropulseIXXI wow you must be very smart

@ontime. Жыл бұрын

@@pyropulseIXXI Bruh this is physic, not algebra. Veritasium talked about p, and any of that formula, and that gravitational thingy which idk how can they came up with that idea. I only understand the basic mgv and VI the rest about planck & magnet thingy not really stuck in my head.

@kcwidman 7 жыл бұрын

The kilogram is being redefined in the United States? How ironic.

@arda9437 7 жыл бұрын

Kai Widman the us got roasted by kg

@Hauketal 7 жыл бұрын

Kai Widman Not only, but also in the US. See the overview at 8:20 for some of the others. I can't identify all, but at least France (LNE), Japan (NMIJ), and Germany (PTB) are involved. This is for the balance only, others must be added for Avogadro counting. It's a worldwide cooperative effort, by about everyone having enough money to participate.

@WarheaddVids 7 жыл бұрын

My phone got stolen so?

@sparqqling 7 жыл бұрын

Indeed the Americans already converted, the 9mm is the most used.

@WarheaddVids 7 жыл бұрын

My phone got stolen it doesn't matter

@Kraigon42 7 жыл бұрын

This kind of thing is what restores my faith in humanity.

@christianosanjo 3 жыл бұрын

Hi ate you still active?

@christianosanjo 3 жыл бұрын

I mean *are*

@Kraigon42 3 жыл бұрын

Define "active"

@eljahihamgottin4540 3 жыл бұрын

@@Kraigon42 alive

@splenden2235 3 жыл бұрын

Do you still have faith in humanity?

@akashpatel-cb1dq 5 жыл бұрын

You described it so beautifully.I understood the head wrenching process to define the units using the best available methods.

@IAmTheRealUsopperGoddamnit 7 ай бұрын

Great video. I was having a hard time understanding it from the basic definition from my textbook and wikipedia, but after watching the process behind it and the equations involved it is crystal clear now.

@JOELwindows7 7 жыл бұрын

R.I.P., Elder Kg, 1799-2017 You'll be missed.

@supertaakot 7 жыл бұрын

Hey that's actually a nice name for the platinum-iridium weight in Paris xD HAIL ELDER KILOGRAM

@JohnSmith-kt3yy 7 жыл бұрын

TheOneAndOnly Tako ALL HAIL ELDER KILOGRAM

@walkinmn 7 жыл бұрын

Joel Robert Justiawan well according to the video, is not death yet, may be it can survive 2017

@MrMineHeads. 7 жыл бұрын

Joel Robert Justiawan actually it should be 2018

@E1craZ4life 7 жыл бұрын

There are still going to be kilogram replicas around even after the kilogram is redefined; it'll just be easier to track fluctuations in mass.

@RamiShreds 7 жыл бұрын

I will have to come back and watch this video again when I am not high

@NikhilTawde 7 жыл бұрын

I wasn't and still couldnt get most of the video.

@NonDelusional74611 7 жыл бұрын

RV -- Sometimes, a small high helps.

@phillaboody260 7 жыл бұрын

It only makes sense when you are high

@RiseWithTheFallen222 7 жыл бұрын

Fucken amen brother

@royalesniper3092 7 жыл бұрын

fr 😂

@observingrogue7652 5 жыл бұрын

I couldn't stop smiling through this whole thing. My face hurts. As an amateur Electrical, Mechanical, and Structural Engineer. Just seeing what it takes to maintain the consistency of measurements, is really interesting & exciting to me. Thank you, this channel, for showing me this. And I thank the scientists doing that.

@peppermintmiso4341 4 жыл бұрын

I didn't really understand much like I know what you mean, but I really just like how you talk and I like listening to it while doing something. The talks and your voice are soothing, really

@SiddheshNan 7 жыл бұрын

brain.exe has stopped working

@nagajoj 7 жыл бұрын

SiddheshNandurkar I feel you bro.

@conexant51 7 жыл бұрын

Yeah, you should delete that file permanently.

@DarkLink1996. 7 жыл бұрын

Инесса Осипова I have more than a few questions.

@parodoxis 7 жыл бұрын

Stop running it on Windows

@BluntforceJ 7 жыл бұрын

nice to see people who are not like "this is easy to understand if you know basic high school science" this dont look or sound basic to me

@Hatch61 7 жыл бұрын

I will not lie, and tell you that I understood everything that you just said, but enough to understand that an amazing amount of work happens behind the scenes to provide the folks like me that use these standards daily to be able to rely on them being constant. I enjoy your channel.

@Wave1dave 6 жыл бұрын

I'm doing my semestral project on this topic and I have to admit it's really crazy! That amount of work they put into this is just astonishing. Everything has to be perfect, everything has to be measured precisely many times and when they are done, they improve the Watt balance and have to start all over again.

@xxportalxx. 5 жыл бұрын

Well, unless you're a physicist you probably don't rely on this, considering that all of the measuring equipment that anyone uses is going to be off by magnitudes more than those 'innacurate' standard weights they spoke of at the start

@arif4896 6 жыл бұрын

this is what makes me even more loves in the field of physics

@chitrasingh44 3 жыл бұрын

Veritasium, that's a brilliant job in explanation!! What we need is a children's book explaning this, so young students learn to appreciate what 'exactly' are we speaking of when we talk about physics ( the basic building blocks), instead of just learning to solve equations. Will work wonders for many!!!

@TheLittleGuy1 7 жыл бұрын

Video on the Quantum Hall Effect ?????

@veritasium 7 жыл бұрын

maybe at some point...

@mesaprime4368 7 жыл бұрын

TheLittleGuy frost prime, what are you doing here?

@TheLittleGuy1 7 жыл бұрын

nearly mastery 22 got to rep my favourite game

@ajayrawat9317 7 жыл бұрын

Veritasium which nextflix series were you talking about ? I would really like to watch that. Also Digits was amazing

@BrillouinBoi 7 жыл бұрын

The Quantum Hall effect is crazy complicated. You need grad physics background to really understand even it's simplest integer form. More complicated fractional forms are still being researched to this day. Really cool though. I hope Derek is up to the challenge.

@koosnaamloos4291 7 жыл бұрын

My physics teacher literally recommended your channel to our class, guess who's watching your videos now? Edit: As a VWO6 student I should know how to speak English XD, dutch people will understand

@averyshaham1697 7 жыл бұрын

Koos Naamloos Your teacher 😛

@mistertheguy3073 7 жыл бұрын

Koos Naamloos hoe heet je leraar?

@Henry_Jr_Watsson 7 жыл бұрын

Mattie, paas me je msn dan

@blzahz7633 7 жыл бұрын

Jack Bauer? Did.. did I win?

@RAiNfORAiNbOW 7 жыл бұрын

Koos Naamloos Only you

@robertginsburg8113 2 жыл бұрын

As a kid who grew up with public education and working parents I just wish videos like this would have been around when I was a kid. Not that I have any complaints because I don't but I can only imagine that my life would have probably taken a much different path. Physics is such a fascinating subject.

@gabemoser1 6 жыл бұрын

I’d like to see how the standard kilogram diverges from the new definition

@rumhave9632 2 жыл бұрын

3 parts per billion in 100 years. Scientists are bored, however, i still watched the whole video.

@DigitalDiabloUK 7 жыл бұрын

You lost me right after "basement"

@GozUnlimited 7 жыл бұрын

Sub-basement dude. Sub-basement. Probably best to avoid the rest of the video

@user-fx7ce8xc1d 5 жыл бұрын

@@GozUnlimited lol

@Dodo-rb4zf 7 жыл бұрын

How about we eliminate Galon, Pounds, Foot, Inches?

@Boz1211111 7 жыл бұрын

Nah why would you simplify the world if you can screw it up even more

@sparkyenergia 7 жыл бұрын

Trump is probably working on that.

@GeminiWoods 7 жыл бұрын

Trump is "working" on a lot things. Doesn't mean it's actually getting done, or making any progress.

@my3dviews 7 жыл бұрын

The U.S. has its own gallon (3.78 litres, vs 4.54 litres), which is different than the imperial gallon used in most other countries (that don't use metric or use both).

@wundsalz6831 7 жыл бұрын

Why would you want to discard the superior imperial system in favor of this overly complex SI-nonsense? Being able to measure mass, weight and money using the same unit is convenient.

@movax20h 5 жыл бұрын

This is brilliant. The gravimeter doesn't even require calibration per se. It needs to be only traced back to distance and time, not easy to do using frequency standard and laser interferometry. Brilliant.

@crisrose9707 5 жыл бұрын

I am glad you went into as much detail as you did since even though some might not know everything that you talked about, if you skipped it all then nobody would have understood it whether they knew what you were talking about or not :)

@SchiferlED 7 жыл бұрын

It somehow makes me sad that they didn't redefine the meter such that light was 300,000,000 m/s

@KaosFireMaker 7 жыл бұрын

Eh. could always go with the plank system of measurement. The speed of light in that is one plank length per plank moment. The gravitational constant is one cubic plank length per (plank mass times plank moment squared).

@HakingMC 7 жыл бұрын

It'll be costly if they did, as there would need to be a lot of changes in the world.

@Saki630 7 жыл бұрын

that is not the exact speed of light sir. You have a meter set by a velocity that is incorrect which would make your meter incorrect and so your judgement.

@vigneshr6644 7 жыл бұрын

Saki630 he means that the length of the meter itself be altered to get a a number of 300000000 m/s

@poisonouspython1410 7 жыл бұрын

+SchiferlED Yeah, I agree since the meter is technically an arbitrary unit of measurement I'm not sure why they didn't set it to a nice round number in relation to light speed. I guess changing the standardized length of a meter would cause too much hubub around the world so they had to leave it alone. Bummer though since they're going to all the trouble to redefine the kilo they may as well do the meter while they're at it so it's all neat and tidy.

@prathameshkale9011 7 жыл бұрын

make kilogram great again

@Donglator 7 жыл бұрын

make America before am bad good now again

@matiasvf2520 3 жыл бұрын

your series on the kilogram saved an essay I had to do for tomorow :) thank you

@ingsve 5 жыл бұрын

You should do a video about the discrepancies between the Kibble balance and the Avogadro project. As you might have heard the measurements never had time to completely settle before the deadline to fix the constants so that left a discrepancy between the two constants with regards to the kilogram based on what method you use to realize it.

@TheRostedChickenz 7 жыл бұрын

Just imagine if the janitor erased that whiteboard

@Wumbolo 7 жыл бұрын

Imagine if the janitor was Matt Damon

@abadlydrawnsnowman1648 7 жыл бұрын

verisatium loved your comment omg

@smidgeyify 7 жыл бұрын

Soooo, Matt Weighmon?

@dhkatz_ 7 жыл бұрын

If you really think they didn't write that down, you have a severe lack of brain function.

@dannydevito7000 7 жыл бұрын

+Doctor Jew If you cant sense obvious humor you have a severe lack of brain function.

@MyNameIsSimple72 7 жыл бұрын

Kilogram machine 🅱roke

@BallistaBomber 7 жыл бұрын

David DeGOAT Understanda🅱️le, have a nice day

@poissondesruisseaux3650 5 жыл бұрын

Thank you! I was looking for that video to explain me why h was better than the mass of carbon 12. Two thumbs up!

@rifdifirebolt 6 жыл бұрын

it's 2018 I'm still waiting on the final result for the definition of the Kilogram. Oddly excited for it.

@kcwidman 7 жыл бұрын

Even though I have only taken a basic level high school physics course, I still really enjoyed the use of the equations to illustrate the complicated nature of this problem. I tried to follow along, and I'm sure I failed, but I got the gist of it.

@megatrix500 7 жыл бұрын

I mean, having taken all of the high-school physics lessons and having touched on college physics too, I can certainly tell that those formulas were quite simple for something as huge and important. Still not SO simple, and also they're used with high-tech measurements, so not at the reach of any physicist, but it's really cool that something as important is also so understandable.

@chandel9449 7 жыл бұрын

Kai Widman Everything he did with the math is basic Algebra. No physics knowledge is needed to see what is happening. If you want to know more about why these particular formulas work, you need knowledge of physics.

@kardo7837 7 жыл бұрын

I've only taken my high school courses, and I understood the whole concept easily after watching it twice

@anaangueira1797 7 жыл бұрын

I've been waiting for this video for years.

@Mac1PC 5 жыл бұрын

Here is a question: Why is the unit of weight for solids is 1 kilogram and for liquids 1 liter? Should it not be 1 gram or 1 kiloliter? I mean 1 kg is already 1000g. Also 1 kg water = 1 liter kind of odd. It should be gram and 1 liter so then 1g=1l simple.

@sonicspring6448 5 жыл бұрын

The liter is a unit of volume, not mass, which the kg is. The world "weight" is sometimes used for the downward force of an object, and sometimes for its mass. Besides, the volume of 1 kg of water is dependent on its temperature, to be precise. Re your final comment, the gram was defined when a different system of units was being used - CGS for centimeter, gram, second, and when the switch to MKS (meter, kilogram, second) was made it tied everything together.

@Mac1PC 5 жыл бұрын

sonicspring l know about weight and liquid. I was talking about different powers of 10 for similar units of measure. Thanks for the reply. I was hopin youtube gods would answer. I thought it was a worthy question.

@SaraBearRawr0312 6 жыл бұрын

Oddly, this is one of the few videos by you with math that i actually was mostly able to follow do to it using pretty basic physics based on DC electricity and standard mass units.

@Biochemguy 7 жыл бұрын

I always knew that the Kilogram would be made into a true constant similarly to how the meter and other units of measure have been. This solution is just so elegant in its simplicity (despite not being simple to carry out) that I find it beautiful.

@yepok5120 6 жыл бұрын

you spelt metre wrong

@EGL24Xx 5 жыл бұрын

@@yepok5120 you spelled meter wrong

@nikoladragovic9283 7 жыл бұрын

8:42 *Hey V-sauce, Michael here*

@biblical_figure 7 жыл бұрын

Where are your fingers?

@Bebolife12345 7 жыл бұрын

But... how do magnets work?

@M.A.S.-SuperiorService- 5 жыл бұрын

I like absorbing as much knowledge as i can from your vids bc even if i didn't get it all I'm at least a little less ignorant than i was 949 secs. Ago

@M.A.S.-SuperiorService- 5 жыл бұрын

589 seconds 9 minutes and 48 seconds

@M.A.S.-SuperiorService- 5 жыл бұрын

Make a video on why we go to 60 instead of 100

@4ur3n 4 жыл бұрын

You have misplaced a full-stop right there.

@M.A.S.-SuperiorService- 4 жыл бұрын

@@4ur3n sorry?

@oskarjung6738 3 жыл бұрын

Nice, way of thinking.

@TheoBerkhout Жыл бұрын

Interesting to see that imperial units are a conversion of metric standards held in the USA.

@MrMakae90 7 жыл бұрын

How much h p n² f² / 4 g v do you weight?

@hanseidottersauger5663 7 жыл бұрын

Lucas Balaminut was "more" right but wrong since p, n, f, v are not constant

@moki2093 6 жыл бұрын

Lucas Balaminut weigh*

@mainBaisch 6 жыл бұрын

actually they are constant, because it will be defined by what measurements they take in that room

@jellybean4163 6 жыл бұрын

Lucas Balaminut jgf

@piyushsonone7 6 жыл бұрын

so easy

@UmVtCg 7 жыл бұрын

The US has a Kg, now it is time to stop all the sillyness and to start using it.

@kallewirsch2263 7 жыл бұрын

:-) They already use it. It is just, that they have different names for it.

@nameofthegame9664 7 жыл бұрын

Allie Cat the pound is defined by a 96 year old man from Dallas. He walks out in the wood until he finds a rock that he deems the right one. Then he puts it in a bucket of 89% moonshine made of corn and drinks every drop that pours out. Then he takes a piss after 2 days and it must be a Wednesday. And then he weighs the urine and there you have it! 1 pound! The job as the guardian of 1 pound is a trait that's been passed down through generations.

@jakadirnbek7141 5 жыл бұрын

Mars Climate Orbiter agrees 🔥

@ignispurgatorius5297 3 жыл бұрын

Seeing your examples in the beginning, somehow it feels like we missed a huge chance here to redefine the meter or the speed of light to be a fraction/multiple of 300.000.000 ;)

@vesper7312 3 жыл бұрын

While that would be really handy, it wouldn't be an easy change, countries would have to change road signs to match the new definition, programs that use measurements like modeling software would have to redefine their definition of a meter, anything involving the old definition of the meter would be invalidated. On the other hand, you couldn't just round the speed of light up and keep the meter the same because then the speed of light wouldn't reflect the actual speed of light.

@ignispurgatorius5297 3 жыл бұрын

@@vesper7312 I know it would require quite a bit of change for measuring equipment, though I think as far as everyday stuff goes the difference would be non-existent. Any significant change only occurs at the 4th decimal place. That is a prescision that would hardly effect normal things people use, like roadsigns. Software is also among the more easily things to fix, as that is just definitions that can be adjusted. The real pain would be measuring equiment in industries which actually require this kind of prescision. My comment was obviously a joke though. ;)

@andrew7955 3 жыл бұрын

The radius of the earth would be redefined as 4km different to what it is now... seems like basically no different. I'll keep using c=3×10^8 m/s

@vesper7312 3 жыл бұрын

@@andrew7955 It practically isn't a difference for most things, but different tasks require different levels of precision. It's perfectly fine to use c=3x10^8 as an approximation, but any result that is derived from using that value is limited to a single significant figure.

@studio48nl 3 жыл бұрын

Yeah, like they almost redefined pi to be 3 . because it would be easier ... lol

@thaomy4293 6 жыл бұрын

Bro ur videos are so interesting man!!!! Keep up the work i love u dude

@soulstealingginger3612 7 жыл бұрын

Did I hear that we're setting the new definition of the kilogram in... America? Hopefully more changes to follow...

@cowardly_wizard 7 жыл бұрын

TheSoulStealingGinger With a sphere crafted in Australia. I don't remember the video very well, that's where he was right?

@slendy9600 7 жыл бұрын

Two Good i feel like i woulda heard about it if its being done over here. you sure it wasnt Austria?

@Farathus 7 жыл бұрын

TheSoulStealingGinger it's civil research. that kind of research doesn't know boarders for decades. you probably have dozens of scientists of different nationalities work on that. also that scientist has a very strong Austrian German accent ;)

@betaich 7 жыл бұрын

The effort with the Silicon thing is a world wide effort. The raw silicon was created in Germany, than send to Russia for refinement, than send back to Germany to form a monocrystalline structure, than spheres were formed in different country, one of them Australia and measurements also take place around the world.

@yettameter 7 жыл бұрын

TheSoulStealingGinger I remember hearing from somewhere that the US govt. officially recognizes the metric system, but does not officially recognize the imperial system. In fact, all modern definitions of imperial measurements are defined by metric counterparts (the inch is defined as 2.54 cm for example). Measurements for science and engineering are always in metric. However, too much of the US's populace is too used to imperial, so changing all the signs and books in the country would be both be expensive and not very fruitful.

@amitanand7534 7 жыл бұрын

it would be cool if we measured a kilogram by how much light bends when it passes by 1KG due to the gravitational dip in the fabric of space time.. impossible but quantifiable

@Andrew0you0tube 7 жыл бұрын

Amit Anand Wow, great idea actually

@illidur 7 жыл бұрын

it would have to be close to a perfect sphere

@amitanand7534 7 жыл бұрын

ohh yea

@walkinmn 7 жыл бұрын

That actually sounds great but i think that it would require a measurement system so sensible that i don’t know if it exists, a perfect sphere, and I'm not sure if you can do the measurements on the surface of the earth.

@sakshisaxena7587 7 жыл бұрын

+walkin mn i agree. Also, if we miss it even once then we might have to wait for a very long time to measure it again and recheck it.

@ChristAliveForevermore 5 жыл бұрын

Everything in science can be distilled down to the relationships between weights and measures. Kinda blows the mind.

@Nikioko 4 жыл бұрын

Originally, the metre was defined as 1/10 million of the meridian from the north pole over Paris to the equator. And that is slightly longer than the second pendulum which is also said to be about 1m long.

@ThePaintballgun 7 жыл бұрын

This episode was way better than most of the others.

@Nihilore 7 жыл бұрын

Watch his latest Veritasium2 video where he explains the recent drop in quality. it was an experiment all along!

@Austin-dm5bp 7 жыл бұрын

Nihilore - Royalty Free Music Was going to say this too. I'm really enjoying watching Derek's videos and seeing his meta-experiment in action. I hope he shares if this much more technical video fares differently in KZfaq's algorithms than the other, more simple ones he's been experimenting with lately.

@AnonymousAZ 7 жыл бұрын

Veritasium Sauce here

@supertaakot 7 жыл бұрын

Verisaucium :^)

@MrtinVarela 7 жыл бұрын

Veritasauce

@gautamdiwan5952 7 жыл бұрын

Martín Varela vsauce

@nomadic-loyalist 7 жыл бұрын

Veritasium Sauce Veritasiu Sauce Veritasi Sauce Veritas Sauce Verita Sauce Verit Sauce Veri Sauce Ver Sauce Ve Sauce V Sauce VSauce

@transcendentape 7 жыл бұрын

It's Dirk from Veratablism.

@braveecologic2030 4 жыл бұрын

What an excellent video. Well described. Thanks.

@balapesar 6 жыл бұрын

Super!! Thanks for all your wonderful efforts

@florinsimion6466 7 жыл бұрын

so four potatoes about a kilo...init?

@truebluekit 7 жыл бұрын

Healthy potatoes you got there.

@eeshaan1539 7 жыл бұрын

laughed so hard!

@RoScFan 7 жыл бұрын

Simion Florin can you measure those potatoes to an accuracy of a billionth of an electron?

@florinsimion6466 7 жыл бұрын

yes...as long as they are Irish potatoes init?

@minecrap5256 7 жыл бұрын

yes... as long as each potato is equal and weighs 0,25kg

@jonathanwilhelm8891 7 жыл бұрын

I would like to know more about the quantum mechanics that is beyond the scope of this video. Thank you great video.

@santeebandit3246 3 жыл бұрын

Stumbled across this channel this evening 3-2-21..and although I’ve zero scientific background, I find the subjects discussed on this channel to be amazing. I love science, although I never excelled at it. Still interests me regardless.

@betaneptune 2 жыл бұрын

Cool video. Also KUDOS! for not using and "musical" background. Nice and easy to listen to the narration and absorb and think about the content. Thank you!

@Moxie9 6 жыл бұрын

-It's that easy, yeah. -It's that easy. Me: Ok, I am out of here :D

@Yolwoocle 3 жыл бұрын

They were joking, haha

@kagura7107 3 жыл бұрын

And you're smarter than you think :^)

@ScottLahteine 7 жыл бұрын

I love seeing how previous technological discoveries help to form the scaffolding for new ones. At nearly every juncture we have been justified to say "this was never possible until now."

@jiaminzhu406 6 жыл бұрын

Hey Derek. Love you video. Could you maybe also make a video about the experiment of redefining length?

@neelimams5303 6 жыл бұрын

Thanks for the valuble informations expecting more from You 😊 !!

@deluxeassortment 7 жыл бұрын

Man, that's heavy.

@andersonsmith8625 7 жыл бұрын

Why is the kilogram called the kilogram. It has a prefix even though its SI. Shouldn't it be renamed the gram and everything shifted down by 10^3?

@genessab 7 жыл бұрын

anderson Smith we'd have to change every book including those written hundreds of years ago, it's just too annoying to matter.

@sytuma 7 жыл бұрын

originally the unit was the gram but since it is so small the more common unit of use was the kilogram.

@ZeroTehShadowz 7 жыл бұрын

A teacher once explained it to me. Here's what I remember! Back when the first metric system was being proposed the standard for mass was named 'Grare' (I don't know what it means, I don't speak French). The French Revolution was also happening at the same time and, apparently, 'Grare' also was a reference to the nobility, so for the sake of not being beheaded they changed it to gram, and they reduced its size to help bakers and stuff make small measurements (like the amount of flour they needed to make bread) more consistent. Later they realized that most people were not measuring small enough masses for the gram to be convenient, and since they couldn't go back to the 'Grare' they just multiplied the gram by a thousand and left it at that. After the French Revolution, most of the world just accepted the kilogram as a standard and asked no questions because it was convenient, I guess. Again, I may be forgetting a lot of details since I don't speak French and I heard the story ages ago, but that was the gist of it

@fatexx544 7 жыл бұрын

anderson Smith I recommend looking up the "roundest object in the world" video, also by Veritasium. He not only explains the other method of fixing the kilogram (a sphere of silicon atom), he also explains how the kilogram got its name.

@AnirudhGiri 7 жыл бұрын

The SI unit of mass was actually the gram. But it was too small for practical use and so the Kilogram was made into the SI unit of mass. Renaming the kilogram and shifting everything down by 10^3 would just cause confusion.

@concettamiccio5814 9 ай бұрын

Great explanation! Thank you very much.

@brojakishormandal1676 6 жыл бұрын

Please a video on definitions Of all 7 si base units

@gameo2001 7 жыл бұрын

When you pass without studying... 8:35

@mz7315 7 жыл бұрын

@alexsoen 7 жыл бұрын

"easy, ja !" :D slightly german accent ;)

@shreyaskul 7 жыл бұрын

That's monthly dose of physics.

@Jeffrey314159 6 жыл бұрын

We can, as a stop gap measure, implement the Metric Mile(=1500m) on all of our interstate highways (and government roads). This metric mile would approximate 0.93 standard miles. Then this metric mile could be divided into 5000 metric feet. The metric foot will equal exactly 30cm or 11.8 inches.

@Roozyj 4 жыл бұрын

Up until now, I was able to understand almost every video of Veritasium I watched, but this goes waaaay over my head. Maybe because It's about electricity

@ApplepieFTW 7 жыл бұрын

Now imagine everything we know is wrong and plancks constant turns out to not be a constant value

@xiLoveYouix 7 жыл бұрын

but... it is constant. The relationship between a photon's energy and its frequency is absolute. There is no way that it could change?

@slaughterround643 7 жыл бұрын

I'm pretty sure he knows guys, he's just making a hypothetical situation

@Reydriel 7 жыл бұрын

That's always a thought I had. What if these constants weren't fixed? Maybe, in some other part of the universe they change? It's all very sci-fi buts it's interesting to ponder :D

@DanielDeVito89 7 жыл бұрын

We'd have bigger problems than not having a fixed definition of the kilogram

@Kori114 7 жыл бұрын

Exactly what I was thinking. or what if they change in time and 10,000 years from now they won't understand how adult humans weighed 100 kg because it could have shifted an order of magnitude lower. The science does seem pretty clear right now that these are constant. But how will we know later if this changes? Also, it might be a stretch, but is it possible to measure these to such precision relative to each other? Does quantum uncertainty itself not affect our ability to measure these constants to such a degree of precision? I would imagine they considered that for this application though... But quantum theory has only been around 100 years, things could change... Like Feynman said, we don't really understand quantum mechanics.

@zaza5042 7 жыл бұрын

the new kg will be 1/1000000th of your debts paperwork

@Ethereal_Phoenix_ 2 жыл бұрын

Watched the ORB video right before this, very cool to see how this story developed.

@waynepalmar6101 6 жыл бұрын

love this channel

@sheriif 7 жыл бұрын

This was all in my A2 Physics exams (including the hall effect), where we were asked to derive each of the individual equations stated in the video, except for the josephson effect...

@Hoshimaru57 7 жыл бұрын

I had a thought. We have a scientific definition of what a kilogram is, but is the scientific definition for metric length? Ah, here we go: "the prototype meter was defined as 1x10-7th of the length of the meridian through Paris through the pole to the equator." There's a more accurate definition now, but I wanted to know where it started.

@RyanPaton 4 жыл бұрын

It was a fascinating video and I would love to know more but it certainly was not explained in a way that I could understand fully.... I mean I understood broadly what the steps were but not actually why they were the way they were. .i'm looking forward to actually researching this more in-depth and to hopefully be able to actually understand and see the process of all these steps...

@dhiahassen9414 4 жыл бұрын

Kilogram from wikipedia : The kilogram is defined in terms of three fundamental physical constants: The speed of light c, a specific atomic transition frequency ΔνCs, and the Planck constant h. The formal definition is: The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.62607015×10−34 when expressed in the unit J⋅s, which is equal to kg⋅m2⋅s−1, where the metre and the second are defined in terms of c and ΔνCs.[3][4] This definition makes the kilogram consistent with the older definitions: the mass remains within 30 ppm of the mass of one litre of water en.wikipedia.org/wiki/Kilogram

@sandderi 7 жыл бұрын

It is awesome that there is a science channel that does not try to overly popularize a subject. For people with knowledge on physics this was extremely informative. I can now easily describe how the kilogram is defined. Thank you!

@-.._.-_...-_.._-..__..._.-.-.- 7 жыл бұрын

Why is everyone so confused? Basically, the only new principle involved is that instead of power being generated by the relative motion of conductors and fluxes, it’s produced by the modial interaction of magneto-reluctance and capacitive diractance. The original machine had a base plate of prefabulated amulite, surmounted by a malleable logarithmic casing in such a way that the two spurving bearings were in a direct line with the panametric fan. The lineup consisted simply of six hydrocoptic marzelvanes, so fitted to the ambifacient lunar waneshaft that sidefumbling was effectively prevented. The main winding was of the normal lotus o-deltoid type placed in panendermic semiboloid slots of the stator, every seventh conductor being connected by a non-reversible tremie pipe to the differential girdlespring on the ‘up’ end of the grammeters. Moreover, whenever fluorescence score motion is required, it may also be employed in conjunction with a drawn reciprocation dingle arm to reduce sinusoidal depleneration.

@cinquine1 7 жыл бұрын

David S. What a waste of words. You could have just said "they use a turboencabulator", and everyone would understand.

@megatrix500 7 жыл бұрын

And people saying this video was complicated. What if Derek told us all of this with these technical words? I know quite some stuff about physics but I have no idea what a turboencabulator even is.

@TaiViinikka 6 жыл бұрын

Sadly, many otherwise-smart people still don't know how to build their own turboencabulator. Some don't even know what it is!

@odavenport7smal 6 жыл бұрын

David S. You actually had me up until the fourth sentence...

@samurlaxiv4907 6 жыл бұрын

This is simply awesome !

@shyleshsrinivasan5092 5 жыл бұрын

Thanks a lot for this video !

@GustaveMichel 5 жыл бұрын

The next General Conference on Weights and Measures is so close now! November 13-16, 2018. We will be getting new definitions of the kilogram, ampere, kelvin, and mole (according to Wikipedia)!

@MattMcIrvin 5 жыл бұрын

To take effect next May, I believe.