Who decides how long a second is? - John Kitching
Рет қаралды 2,299,856
3 жыл бұрынDiscover how scientists developed atomic clocks, which use the vibrations of atoms to measure and maintain a globally consistent time.
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In 1967, researchers gathered to answer a long-running scientific question: just how long is a second? It might seem obvious at first. A second is the tick of a clock, the swing of a pendulum, the time it takes to count to one. But how precise are those measurements? And what is that length based on? John Kitching digs into how we scientifically define this fundamental unit of time.
Lesson by John Kitching, directed by Tjoff Koong.
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@abbyf1183 3 жыл бұрын
This is what Ted-Ed is for: answering random questions you’ve always wondered about.
@TheIndieGhost 3 жыл бұрын
its for answering random questions i've never wondered about until they've asked it and I think "huh, that's a good question"
@ilickcatnip 3 жыл бұрын
Or rather, it's for : answering the questions we don't find answers to in schools because they are 'not quite important'
@ishworshrestha3559 3 жыл бұрын
So why do we need to measure such small chunk of time we will almost neglect it in most part of physics?? I mean since theta is very small sin(theta) = theta to derive pendulum time period...Huh?? Well maybe because of some specific cases like GPS when neglecting difference of arrival of small unit of time can give us inaccurate data of where person is located by factor of thousand miles I guess... 😅😅
@ashutoshmahapatra537 3 жыл бұрын
@@ishworshrestha3559 Also that sin theta= theta thing is mostly used for exams and theory I guess, while when they are really dealing with real life problems I think they must be using actual value instead most of the time.
@anadraguleanu8710 3 жыл бұрын
Agreed!
@Kenjinu 3 жыл бұрын
The only person who decides how long Is a second is our parents counting down from 10 to clean our rooms
@priyanshudutta9463 3 жыл бұрын
Underrated comment 😂😂
@skibur848 3 жыл бұрын
So when it hits 2 everything slows down
@yourtrashcan7 3 жыл бұрын
definitely 😂
@feero9680 3 жыл бұрын
True af
@lilypads3033 3 жыл бұрын
@@skibur848 Parents: ZA WARUDO
@XEinstein 3 жыл бұрын
As an engineer I wonder: how the heck did engineers in the sixties make a device that apparently was able to count something more than 9 billion times in one second. 🤯
@joelm4887 3 жыл бұрын
Yes, I'd still like to know how it's done now.
@whi2gan 2 жыл бұрын
SAME
@brudamonas8208 Жыл бұрын
@@abiryaakovalmoznino3395 computers don’t think for us, they do work instead of us
@Ausea33 Жыл бұрын
@@abiryaakovalmoznino3395 Yes they can crunch numbers that would otherwise take far far too long for a human to replicate
@Ausea33 Жыл бұрын
@@abiryaakovalmoznino3395 Wait I think I misunderstand your position here. I'm not saying that's all computers can do, but they can assist humans with doing work that is otherwise too tedious or impossible within a reasonable time frame. Obviously they can do more than crunch numbers.
@beactivebehappy9894 3 жыл бұрын
This is how I want everything to be taught in schools. Not the other way around. Like telling first, we have Cs-atomic clocks and then justifying it. "The best explanations of human phenomena lie in story-telling and not justifications." - me
@veen88 2 жыл бұрын
That's brilliant quote 👍
@davidsevic8317 2 жыл бұрын
@@veen88 you really quoted yourself
@Jordan-oy3bg Ай бұрын
You should be a professional quote maker
@glorysky1998 3 жыл бұрын
"Who decides how long a second is?" Me: Mississippi.
@TheIndieGhost 3 жыл бұрын
i see
@zyansheep 3 жыл бұрын
1 Mississippi 2 Mississippi 3 Mississippi...
@cibinthomas4007 3 жыл бұрын
Ross after reading this: *I'm fine*
@dontspikemydrink9382 3 жыл бұрын
@Grzegorz Dziedzic what
@shalevasor911 3 жыл бұрын
@Grzegorz Dziedzic what
@ead630 3 жыл бұрын
*Why does this channel know the questions I want to ask before I ask them?*
@blueeye2281 3 жыл бұрын
Because the one who makes this videos already asked themselves in their childhood.
@hindifabulousstories9817 3 жыл бұрын
By thinking it all questions get begin *Thinking of a human being can create or destroy the world* *-Albert Einstein*
@vas2.1025 3 жыл бұрын
Haki.
@jbiliHacker 3 жыл бұрын
@@vas2.1025 hahaha
@feero9680 3 жыл бұрын
Have u asked them a topic before
@essee3984 2 жыл бұрын
The Mahabharat written in 400 BCE defines the smallest unit of time as the wink of an eye. Surya Siddhanta, the Sanskrit Text on Astronomy written a century later clearly defines the smallest units of time from 1 breath (inhale-exhale of 4 sec) to hour,days,months,year,century. Quite fascinating.
@TaraMishra-gs5yd 2 ай бұрын
Wow
@brianking2365 2 жыл бұрын
These videos are incredible. The animation and narration, plus the way the science is distilled and easier to understand makes these such a valuable resource.
@omarhanif9101 3 жыл бұрын
It's strange to think that something so obvious like a second wasn't even a thing years ago. It makes me wonder...
@patrickbueno3279 3 жыл бұрын
yeah it is strange but not really as out of the blue. We have the same problem with economy, evolving throughout the time on what we think is useful to us.
@chandramohan_sonder 3 жыл бұрын
Second has been a thing for a long time, it's the precise definition that we lacked. As pointed in the video, they used the formal definition of the second, you know 365.25x24x60x60, to arrive at a reference that's agreed and replicable all over the world. We didn't use the ticking of Cesium electrons to define second, we used the already existing definition of a second to find out how many ticks the Cesium electron makes.
@GuiiBrazil 3 жыл бұрын
while watching the video I was thinking, from where and when comes the "It will take only a second."?
@hamadhamdi188 2 жыл бұрын
Honestly, we should stop using our planets version of a second for scientific research. It works adequately enough while humans only colonize Earth, but what are we going to use once humans are living on multiple planets, or even beyond this solar system. Our version of a year/day/hour/minute/and second would seem ridiculous to others not born on Earth, since our measurements of time are based on our planets orbit and rotation around the sun. Future planets colonized by humans would find it difficult to learn and remember, especially if their time measurements are not comparable to ours. I think we should define a universal timescale based off a constant that doesn't favor one planet over another. Perhaps use the time it takes light to travel 100,000,000 meters as a new universal second (almost 1/3 of our current second). That way it will be the same no matter what timescale measurements future planets use, and we can set it to a metric system of base 10 for easier calculations. We will all have a common, accurate measurement to share future research with one another.
@ROCKSTAR123456789110 2 жыл бұрын
Hamad Hamdi nah, let em figure it out when they decide to change planets.
@mala967 3 жыл бұрын
This is the definition of “I don’t need sleep I need answers”
@drkshadw01 3 жыл бұрын
oh you sheldon fan !
@enby_dreamsss 3 жыл бұрын
Ironic... I should be asleep
@stef511 3 жыл бұрын
Yeah lol it's like half past twelve in the morning but I'm watching this
@mala967 3 жыл бұрын
@@stef511 it’s 3 am and I just read your comment
@e.knutsson 2 жыл бұрын
@@mala967 I read this at exactly 02:59 am
@AnkitYadav-il2fo 2 жыл бұрын
Wow, what a work this channel is doing, I am so emotional by it's work. I would like to give a special thank to them for spreading free knowledge to us. Thank you so much
@neonWHALE002 3 жыл бұрын
I love these videos, they are simultaneously educational and relaxing; it is certain that they will either teach me something or send me to sleep, depending on which I need more at the time.
@gajendrasonare 3 жыл бұрын
Fun fact: second is called second because it is second division of an hour. i.e 1second = ((1/60)/60) hour
@cardamundo295 3 жыл бұрын
Brilliant fact!
@mung_pi 3 жыл бұрын
@@mrafi7166 ...it's minute compared to a day?
@aryanbhatia1729 3 жыл бұрын
@@mung_pi lmao
@vedants.vispute77 3 жыл бұрын
@@mrafi7166 Everything is made up of minute particles. Every hour is made up of minutes.
@Gabboele 3 жыл бұрын
@@mrafi7166 the word "minute" comes from the Latin "pars minuta prima" , meaning "first small part"... in fact minutes are also called "primi" (firsts) in Italian, idk about English
@Mswordx23 3 жыл бұрын
"With precision that's _second_ to none." We all saw what you did there.
@jahjoeka 3 жыл бұрын
I didn't...
@pkyrohit 3 ай бұрын
That's what a good writing is..
@JustyRBLX 3 жыл бұрын
TED-Ed is the best. It answers all questions you've always wondered about, but never found an exact answer to it. Keep the good work, you help people!
@noyn9142 9 ай бұрын
This question has been on my mind for far too long. Now i finally have a SECOND to look it up
@captainvane104 3 жыл бұрын
And later on we discovered - Every 60 seconds in Africa a minute passes.
@hasanmuhammad6651 3 жыл бұрын
Together we can stop this
@voiceofneha7196 3 жыл бұрын
I was waiting for this
@muhammadhashirsalman4193 3 жыл бұрын
😂😂😂
@weirdface3838 3 жыл бұрын
wtf his fingers are the same length
@Cat_in_Spacetime 3 жыл бұрын
RIP minute.
@jjOnceAgain 3 жыл бұрын
The dislikes are from chemists who were rooting for a different element to be chosen
@adrees 3 жыл бұрын
Actually, Yterrbium or Lutetium are actually used to make the world’s most accurate atomic clock. This will allow for GPS to be accurate within 1 mm which has vast implications for self-driving cars and even store product stock locations.
@Micahsaurus 3 жыл бұрын
What if I disliked this comment?😡
@jjOnceAgain 3 жыл бұрын
@@Micahsaurus Then I'd keep on going with life
@Micahsaurus 3 жыл бұрын
Lol
@smartart6841 3 жыл бұрын
What if i liked this comment like i just did?!😄
@pathikdesai5853 3 жыл бұрын
This used to be my question as child. Thank you for answering. Ted Ed is a great initiative. Keep up the good work.
@uknownada 3 жыл бұрын
I always wondered why such a seemingly random number was picked to define a second! But now I'm wondering how we were ever able to measure an atom's ticking, especially back in the 60's. This video gave me a rough idea about that, but how do those machines work? And how are you able to put a single atom inside? And how do we know if it works the way we think it does?
@farziltheweebo4841 Жыл бұрын
The answer is the most used word in physics "probably "
@uknownada Жыл бұрын
@@farziltheweebo4841 Since I made this comment I did find out how the number was picked! It's because it approximately equalled 1/60 of 1/60 of 1/24 of a day. So just use it to redefine a second, and you're gold. Still not sure how they measure it, though.
@MeekOmni 3 жыл бұрын
I like how the intro turns on the thinking machine in our head
@aname6984 3 жыл бұрын
The animations are so good. The animator has done an incredible job.
@whiteboardanimatorhamna 2 жыл бұрын
Amazing job on animation always!
@astgfrallah771 2 жыл бұрын
Mashallah
@tomfooIeryz 2 жыл бұрын
@@astgfrallah771 Jesus died for your sins.
@attiamustafa8569 2 жыл бұрын
Oh pls be quiet 😒
@abbasshah-jr2uc 8 ай бұрын
@@tomfooIeryzReligion is one's choice. Respect it and accept it.
@gopalakrishnakolapalli1453 3 жыл бұрын
I never seen such a simple and effective explaination about measuring second.
@aworm 3 жыл бұрын
The illustration and animation in this one are amazing
@SunniDae333 3 жыл бұрын
TED-Ed asking the real questions.
@karelprochazka2709 3 жыл бұрын
Last time I was this early, a second wasn’t properly defined
@jerickoposs3747 3 жыл бұрын
Wow you must be old
@kurosakiIchigo9626 3 жыл бұрын
@@jerickoposs3747 LMBO
@Comprehensiveseat07 3 жыл бұрын
Wait a second
@frankydman 3 жыл бұрын
While it is fantastic that we have figured out how to standardize the second, what’s arguably just as mind blowing is the fact that even though we’ve figured out atomic clocks, it doesn’t change the fact that from a physics perspective, we can’t actually prove that time exists
@professorx3060 2 жыл бұрын
Neither can you prove that it doesn't exist
@PneumothoraxBlueneck Жыл бұрын
Its subjective exist and not exist from different perspectives
@krlllx 9 ай бұрын
@@professorx3060 you cant prove anything doesnt exist with certainty
@MrVibriocholerae 7 ай бұрын
We have used time in billions of experiments without problems. That should be enough proof of its existance...
@aminawinterwater2915 3 жыл бұрын
I learn so much by watching these videos! Thank you!
@rekhac12 3 жыл бұрын
The animation never fails to amaze me!
@leeangu7059 3 жыл бұрын
I guess the same PERSON who decides " which AD can be skipped and which can't be! "
@GOD-LOK 3 жыл бұрын
Smart answer and TRUE
@esmirspace4826 2 жыл бұрын
Sometimes I wonder how good schools could be if they incorporated KZfaq as a main source of teaching. So many bad teachers distracted me from learning in the past .If I could use my own mentors here,I would never be bored.There would be no pressure of bad grades,lame books,lame definitions and forced learning word by word...Learning should be fun,not strict...Same goes for testing...Appreciated the smart people that figured these things out ,and I'm thankful for pasionated educators who are so underrated and smart of course.
@space1607 2 жыл бұрын
At 3:35 TED-Ed said that there are 118 elements to choose from but back in 1967 (The time that the conference took place) there were only 105 discovered elements.
@psltmtir Жыл бұрын
Perhaps it also included different isotopes of the same element, which explains why Caesium-133 is specified, and not just "Caesium."
@duckymomo7935 3 жыл бұрын
The definition of a second is defined in 1967, based on a measurement of the number of cycles of the radiation from a particular cesium-133 transition with reference to the second commonly used in civilian timekeeping, which at that time was based on astronomical observations.
@sweatycommenter Жыл бұрын
it says it got measured in 1967 and created another definition for the second, acording to this it was already based on "a day/24/60/60" in late 1500s
@shirleygomes2004 3 жыл бұрын
Thank you Ted-Ed for teaching me so much. You've really made my 2020 knowledgeable. I look forward to watching all of your future videos.
@ZEEQ011 3 жыл бұрын
that is one of the most interesting knowledge i ever known and never have i thought of it. good job Ted-Ed
@fairarizkiano3845 3 жыл бұрын
this narrator's voice is one of my favorite. thank you narrator!
@TristanSamuel 3 жыл бұрын
"Who decides how long a second is?" Uploaded 53 seconds ago *I don't understand*
@GauravKumar-qr8pt 3 жыл бұрын
🤣🤣🤣 nice one
@alex2005z 3 жыл бұрын
Good one
@lilyjay8530 3 жыл бұрын
KZfaq
@swetakumari4747 3 жыл бұрын
Had read about it years agoin brief but didn't seep into mind , only knew that it's related to Cs atom , but now understood it fully . Very well explained.
@yesitsmojo24 3 жыл бұрын
"Atomic clocks allow us to measure time with precision that is second to none" Oh my god, i love this channel
@maxdukhovskoy1406 3 жыл бұрын
This channel answers questions that I never knew I wanted answered
@alvinpoly2781 3 жыл бұрын
Ted-ed always manages to make me watch videos on topics I've never given thought to but never really understood!
@miwochi 3 жыл бұрын
I love how this video is about seconds, and it just appeared to me in seconds.
@DJwldnn 3 жыл бұрын
Lol, same as well
@badhrihari1705 3 жыл бұрын
Same
@user-uq6uj7fn3h 3 жыл бұрын
Lol same
@mayankverma932 3 жыл бұрын
Lmao same
@ind0266 3 жыл бұрын
Abosulutly
@zack7122 3 жыл бұрын
once again the animations are perfection!!! they really accompany what's going on and allow you to understand things so much easier, thanks to all the ted team who put these vids together 🥺💕
@ayrusification 3 жыл бұрын
Ted Ed answers the questions I never knew I wanted answers for!!!!
@karthikkappagantu5885 3 жыл бұрын
I kinda love those quotes that they put at the beginning.
@johnsavard7583 2 жыл бұрын
Another thing you missed: the length of the atomic second was indeed based on the length of the day... but the average length of the day between 1750 and 1892, as determined by Simon Newcomb. This was the basis for Ephemeris Time, a uniform scale of time based on the motions of the Earth and the other planets, and it was the second of Ephemeris Time, not 1/86,400 of the solar day in 1967, that was the basis for how many Cesium oscillations were in a second. That's why they needed leap seconds as soon as the switch to atomic time was made. And this, of course, is central to answering the question in the title.
@user-qx5cn1si1q 2 жыл бұрын
This is actually really impressive. I never even wondered about the topic, mad
@smamoden1523 3 жыл бұрын
I have been wondering my whole life. thank you.
@andevm5922 3 жыл бұрын
The Gregoria Calendar was made in the university of Salamanca, Spain. The British colonies started around XVII, a hundred years later.
@vultschlange 3 жыл бұрын
Video said it was *spread* by the British, not invented by them.
@shirleygomes2004 3 жыл бұрын
When Ted-Ed teaches you more than school.
@unlinedphoton7965 3 жыл бұрын
When Ted ed doesn't teach you more than school " Wait that's illegal"
@srijanumesh5355 3 жыл бұрын
I actually learnt this before. Arrest Ted Ed. It broke the law!
@greyheart3001 3 жыл бұрын
Always did
@nopenope8369 3 жыл бұрын
No it doesn't
@greyheart3001 3 жыл бұрын
@@nopenope8369 You must study in a great school
@OXIR 2 жыл бұрын
This was an amazing video and information. I never knew this historical decision. And I thought a second was decided for much earlier.
@sahilprasad8343 Жыл бұрын
Mann! The animation and the way of explanation are too good on this channel. am a student of 11th grade and these videos helps me a lot to understand some typical writing in HC VERMA book.
@michaelpuglisi1647 3 жыл бұрын
I didn’t know electrons orbited the nucleus of an atom. I was under the impression that instead of it being in orbit around an axis, the electrons existed as a cloud surrounding the nucleus. I also thought these seconds came from the ancient Sumerians who use the number 60 instead of 100 or 10 in their measurements. And the second represented a heartbeat.
@DoomFinger511 2 жыл бұрын
It is a cloud, but it only appears that way because they move so fast. Just like how rain cloud is only a cloud when viewed far away but up close you can see every individual water particle in suspension. You are also right about the Sumerians however they never defined anything smaller then a day. The ancient Egyptians defined hours as 1/12 of the day and 1/12 of the night using a sun dial (hence 24 hours in a day, which is not base-60). The Greeks then made a whole solar day 24 hours and defined an hour as 1/24 of a solar day. It wasn't until the invention of pendulum clocks that sundials were replaced and minutes and seconds could be defined. Because of the math of hours, days, and months; minutes and seconds had to be base-60 in order to be properly geared to have 24 hours in a day. That pendulum swing (or one second) was defined as one swing of the pendulum over one meter of length over the Earth's surface.
@pneumonoultramicroscopicsi4065 2 жыл бұрын
But one heartbeat is variable according to heart rate
@michaelpuglisi1647 2 жыл бұрын
@@DoomFinger511 thank your so much!! Your response was very informative and has given me much to think about!
@psltmtir Жыл бұрын
To add to DoomFinger's comment, the clouds are effectively a way of saying how likely an electron is to be there. We know that the electrons are moving in an orbit around the electron, but it's very hard to know exactly where. The electron cloud analogy is how we know where exactly the electron is going to be orbiting most of the time.
@JustADioWhosAHeroForFun 3 жыл бұрын
Why do people say "I'll be back in a second" when they didn't?
@brodown64 3 жыл бұрын
Truly big brain
@matikashu6033 3 жыл бұрын
“I’ll be back in a moment.”
@unholycrusader69 3 жыл бұрын
@@matikashu6033 me too
@hindifabulousstories9817 3 жыл бұрын
Me too #Matikashu
@vikasjaiswal9888 3 жыл бұрын
Due to Heisenberg's uncertainity principle.
@mounilshah9598 8 ай бұрын
The entire video was a build up for the pun in the last line. Brilliant work 💯
@mohamedoucheikhchewaf4019 2 жыл бұрын
What a great platform !👌🏻
@_syedmx86 3 жыл бұрын
I think heard the narrator's happiness at the "...second to none" joke at the end 5:23
@Tufteputten 3 жыл бұрын
My mom did this thing when she was mad and counted down until I had to have started doing what she wanted me to do. When she came to ONE she would drag it out so long, just to give me a last chance. That's how long I wish a second was, because then I could brag about so many things I do in one second. Just ask my wife.
@shrenalforever2135 3 жыл бұрын
😂😂😂
@satgurs 2 жыл бұрын
"I killed 70 people in a second!"
@kheonArtStudio 2 жыл бұрын
Awesome knowledge just right in time.
@lincyjoby4005 3 жыл бұрын
This video is so informational and underated
@gourisree9991 3 жыл бұрын
"Time is what we want most but what we use worst" -William Penn Just use time wisely Time won't stop for anyone.........
@SMAT-gc3yl 3 жыл бұрын
“Dr Strange would like to know your location”
@pandascheme9266 3 жыл бұрын
The animation is sooo clean !
@amirasyraff7159 3 жыл бұрын
Great video again! I love the animation. Also, please make a video about D.I.D (Dissociative Identity Disorder). People need to learn more about it.
@KuK137 3 жыл бұрын
I like how you said Britain started spreading Gregorian calendar in 1500s when they adopted it in 1752, actually...
@mo__2808 2 жыл бұрын
and also the second dates back way before 1500, as far back as Babylon. It’s not from the British
@shreya...007 3 жыл бұрын
When we count as kids we say tick-tick one, tick-tick two so that we don't count too fast when playing hide and seek lol
@classicambo9781 3 жыл бұрын
What country was that? Haven't heard that before in Australia.
@shreya...007 3 жыл бұрын
@@classicambo9781 Im from India Im pretty sure it's just an Indian thing
@dhruvasoyantar9656 3 жыл бұрын
Mississippi!
@shreya...007 3 жыл бұрын
@@dhruvasoyantar9656 yeah it like saying Mississippi Ive heard some people say that
@dhruvasoyantar9656 3 жыл бұрын
@@shreya...007 I know about about tick tick as well.. I'm an Indian too.. but mississippi just sounds great 😅
@hdr2540 3 жыл бұрын
Wow. So when my parents were born, seconds didn't exist. Mind-blowing. Thanks for the lesson Ted Ed.
@nikoballic1490 3 жыл бұрын
Wtf Ted?!? I have always wander this thing! Thank you bro.
@keddrikyvan 3 жыл бұрын
So if I will be late again in my classes, I can actually reason out that the length of our second was drastically different.
@keddrikyvan 3 жыл бұрын
So if I will be late again in my classes, I can actually say that the length of our second was drastically different.
@davidjupiter4307 2 жыл бұрын
Thanks Ted-Ed for theory of relativity animation there, It means a lot to me ❤👍
@asucitsme 2 жыл бұрын
Absolutely fascinating
@hamad7586 2 жыл бұрын
I mean literally, everyone knows it's TVA who decides how long a second is.
@protector_of_the_realms 2 жыл бұрын
You mean Kang
@brunomachado9634 3 жыл бұрын
Actually, in 1967 there were several elements that hadn't been synthesized yet, so their choice was a little easier!
@salanijames4350 3 жыл бұрын
Ted ed has the best animation ever. Period.
@akilishilo7902 3 жыл бұрын
The animation is absolutely beautiful
@atharvagunde832 3 жыл бұрын
Can I please know what Software was used for this awesome animation ? The animation and the explanation were Fabulous! I love to watch TED videos, always answering some unique questions!
@Rajeevkumar-gz4mv 3 жыл бұрын
Ok, I had this question in mind for a very long time😂😂
@luckynhlanhlatshabalala2475 2 жыл бұрын
I second that. Thanks for this info
@kinni02 3 жыл бұрын
Its about TIME someone made a vid about it
@gartrux 3 жыл бұрын
You forgot that a second is also defined as the distance that light travels in free space in one second, and is equal to exactly 299,792,458 metres (983,571,056 ft)
@MrSprikiting 3 жыл бұрын
I'm interrsted to know how they counted the 9Bn+ ticks of the Caesium atom.
@lunam7249 Жыл бұрын
elves...
@vitharana1996 2 жыл бұрын
Thankyou very much. 😊
@opunpunigyamfi9722 2 жыл бұрын
Thanks very much for this, wow...
@pranav7994 3 жыл бұрын
i guess something like this is needed for other units of measurements too. like how much exactly is a gram
@StraitjacketFitness 3 жыл бұрын
Actually... yeah...
@sciuresci1403 3 жыл бұрын
They already exist for those units.
@bovardgabriel5335 3 жыл бұрын
A gram is 1000 time smaller than a kilogram. A kilogram is the weight of a cubic meter of water at the temperature of 4 degree celsius
@sciuresci1403 3 жыл бұрын
@@bovardgabriel5335 not that's not how a kg is defined anymore. It was changed like 2 years ago. It is completely reliable and based on constants now.
@KuK137 3 жыл бұрын
@@bovardgabriel5335 Cubic meter of water is a TON, you're thinking of decimetre...
@mahantesh1243 3 жыл бұрын
Who decides how long a second is? Ans: John kitching
@NeoFighterX 3 жыл бұрын
The animation is just perfect
@arcticcatgaming9718 3 жыл бұрын
Great video!
@ColHoganGer90 3 жыл бұрын
British colonialism had nothing to do with the spread of the Gregorian calendar early on as Britain was quite late to adopt it in 1752.
@DegreesOfThree 3 жыл бұрын
I've heard the adoption of the Gregorian calendar is a sign of submission to Rome.
@farzanask1088 3 жыл бұрын
Me while counting : 1,2,3,4 Oh I think it's fast 1...,2.....,3.....4.... Too slow 1,2,3,4 aah! where is my phone
@terrancekayton007 Жыл бұрын
Well done 👍🏿 this was fun
@cmlon Жыл бұрын
incredible. Thanks
@fkmyoutube 3 жыл бұрын
Others: That would take 30 seconds. The TED in me: Well, actually, that would take 275,778,953,100 ticks of a Cesium-133 atom.
@brodown64 3 жыл бұрын
KZfaq determined that this video was sent a second ago
@TheEmperorYt 2 жыл бұрын
Nicely explained
@SumitPrasaduniverse Жыл бұрын
Amazing explanation 👌
@mareen129 3 жыл бұрын
and I thought who invented second was just the observer of his heart-beat and was a very calm person.
@organicfarm5524 3 жыл бұрын
And he was most likely 50+ years old at that time.
@twitzmixx8374 3 жыл бұрын
Them: How long is a second? Me: Why did I never thought of this? ;-;
@user-ky7jh7gr3n 2 жыл бұрын
Ty for this vid
@MinityMaths 3 жыл бұрын
Wow really interesting, love the animation too!
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