Iridium - Periodic Table of Videos

Рет қаралды 1,025,143

11 жыл бұрын

Up close with some big samples of real Iridium. Our thanks to Johnson Matthey. See all the elements at bit.ly/118elements
Naming Iridium: • Iridium and Osmium Dis...
Gold Vault: • Gold Bullion Vault - P...
More chemistry at www.periodicvideos.com/
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From the School of Chemistry at The University of Nottingham: www.nottingham.ac.uk/chemistry...
Periodic Videos films are by video journalist Brady Haran: www.bradyharan.com/
Brady's other channels include:
/ sixtysymbols (Physics and astronomy)
/ computerphile (Computer stuff)
/ numberphile (Numbers and maths)
/ deepskyvideos (Space stuff)
/ nottinghamscience (Science and behind the scenes)
/ foodskey (Food science)
/ backstagescience (Big science facilities)
/ favscientist (Favourite scientists)
/ bibledex (Academic look at the Bible)
/ wordsoftheworld (Modern language and culture)
/ philosophyfile (Philosophy stuff)
/ psyfile (Psychology stuff)

Пікірлер: 1 500

@thejumperkin 11 жыл бұрын

"For once I can keep Brady in order" I love this guy so much. He's always so playful yet talks so intelligibly and with such enthusiasm and enjoyment.

@danielprates2208 4 жыл бұрын

His mild happiness with that bar of iridium is contagious, sort of.

@anibrataghosh8978 4 жыл бұрын

I love this professor... I wish I had him in school, every word he speaks has passion for science in it

@petercarlson811 7 жыл бұрын

Looks like someone had fun with the zoom function on that camera.

@littlemanzjordan7267 7 жыл бұрын

Peter Carlson now i can't unsee it

@petercarlson811 7 жыл бұрын

Littlemanz Jordan I know. Isn't it irritating?

@unverifiedbiotic 6 жыл бұрын

Lack of experience. Give an avarage person a camcorder and they'll do this all the time, because they want to tell a story with the framing, but don't understand how to do that.

@qwasd0r 4 жыл бұрын

It's so damn annoying...

@gagannnnn 4 жыл бұрын

In the start i just thought he was focusing on the iridium written on his tie, but then he just won't stop lol

@Chrystair 2 жыл бұрын

The hair, the tie, the glasses, the jokes, the tremor. This man is a character!

@patdohrety2940 10 ай бұрын

I had an eccentric professor in college who reminded me of him.

@Bothorius 9 жыл бұрын

You can tell he is really loves elements at 5:26. I don't think the professor ever fanboys this much over anything. I really like how passionate about his work, and how clearly he demonstrates his excitement. That's what pulled me into these videos on the first place.

@povnw8985 5 жыл бұрын

Teachers like him are becoming harder to find. That's what makes these videos special to me.

@prapanthebachelorette6803 2 жыл бұрын

@@povnw8985 ❤️🧪

@C134B 7 жыл бұрын

The professor does vodka shots?! I'll go there when i finish my pHd.

@trymedorsen3178 7 жыл бұрын

Sebastián Manríquez i was searching for this Comment hahaa

@samuelluria4744 6 жыл бұрын

He's actually a very cool guy.

@AnArchyRulzz 6 жыл бұрын

Shots? Nah he drinks vodka straight like a Russian. Shots are for college kids and girls.

@Gr3nadgr3gory 6 жыл бұрын

Dave Hobbs shots are straight vodka, shots go into mixed drinks.

@povnw8985 5 жыл бұрын

It's hard to imagine him drunk.

@daviddunbar5754 4 жыл бұрын

I've just stumbled on this series. A blast from the past as I worked with Martyn as a humble technician at Newcastle University. He really hasn't changed. All the very best sir.

@prapanthebachelorette6803 2 жыл бұрын

❤️🧪🧪🧪🧪🧪

@MrChet407 5 жыл бұрын

Professor: That's not Iridium *pulls out long Iridium rod* Professor(Aussie accent): That's Iridium.

@brianisme6498 3 жыл бұрын

He’s British not Aussie smh

@cryamistellimek9184 3 жыл бұрын

@@brianisme6498 he’s making a joke you bumbling fool

@brianisme6498 3 жыл бұрын

@@cryamistellimek9184 well, I didn’t suggest it wasn’t did I?

@shadesilverwing0 2 жыл бұрын

@@brianisme6498 No, but you did suggest you weren't aware he was making a joke.

@brianisme6498 2 жыл бұрын

@@shadesilverwing0 when? Where did I say it wasn’t a joke?

@guitarhero2211 9 жыл бұрын

This guy looks like science

@outsidethepyramid 4 жыл бұрын

This guy *IS* science .

@TheHonestPeanut 4 жыл бұрын

He smells even sciencier.

@Broxalax 3 жыл бұрын

He is a scientologist haha

@haveatyou1 3 жыл бұрын

This comment looks like stolen.

@BaileyNisse 3 жыл бұрын

@@haveatyou1 yeah, in every single video

@SebastianHasch 5 жыл бұрын

"this is a metal free zone..." -brings in whole camera equipment 😂 Great video by the way!

@WingDiamond Жыл бұрын

I'd never get in ... "I'm made of Metal ... My circuits gleam" "I Am Iron Man"!

@2wordname 4 жыл бұрын

Legend says that when you don't retest the results of your experiment 3 times before writing your report, Professor Poliakoff will come for your kneecaps with his iridium rod.

@jtc1185 10 жыл бұрын

Martyn, you are an international treasure sir. I've never met anyone who could spark my interest in learning like you have done, thank you.

@darioinfini 10 жыл бұрын

I have been following along the series of elements completely enraptured. The professor is engaging with his knowledge, personal anecdotes, and flairs of coy humor. Am enjoying these very much. Had no idea elements were this fascinating.

@Durrpadil 9 жыл бұрын

Professor, what you need is an Iridium Crowbar: Gordon Freeman's weapon of choice I'm sure.

@Tindometari 5 жыл бұрын

Lol now I'm picturing an action movie starring Dr. Polyakoff. :D

@naiknaik8812 5 жыл бұрын

It would be very heavy so Gordon would have beefy arms.

@jimi02468 8 жыл бұрын

Fun fact: if a 10 kg dumbbell was made of iridium, it would look like it was just 3.5 kg (assuming that "normal" dumbbells are made of steel of which density is 8 g/cm^3).

@peanuts2105 8 жыл бұрын

700,000 tonnes of earth to be mined to get 3.5kg of Iridium. Staggering, just staggering.

@bitTorrenter 5 жыл бұрын

According to Johnson Matthey, the Iridium price was $900 oz t on 19/07/13. That bar weighs 3.8 kg and would have been worth at least $109,953.

@joeblack4436 4 жыл бұрын

For the most part it's not economic to mine Iridium on it's own. More typically it is a byproduct of Copper and Nickel (amongst other) mining.

@flymasterA 4 жыл бұрын

Joe Black , That's what I was thinking. A by-product would be a freebie unless more processing is necessary. I'd like another video.

@joeblack4436 4 жыл бұрын

@@flymasterA I think it's just useful enough for buyers to be willing to carry the cost and probably some profit.

@flymasterA 4 жыл бұрын

Joe Black , Like the tip on a plug, my interested is sparked to find properties and novel uses for it.

@DuderofDudeness 11 жыл бұрын

"might make quite a good vodka glass, actually" someone went hard in college

@CoalCrackerCummins 4 жыл бұрын

Wish the History Channel or Discovery Channel would produce a real show like this

@MegaBoilermaker 5 жыл бұрын

Iridium 192 is also widely used as an isotope for Gamma radiography.

@Silentspeaker3 10 жыл бұрын

So, if it has such a high melting point, what kind of substance is the crucible made of in which iridium is melted?

@buoy9665 9 жыл бұрын

Unobtainium.

@munjee2 6 жыл бұрын

Silentspeaker3 osmium I guess

@whatbizarreactisthecaninep791 6 жыл бұрын

tantalum hafnium carbide crucibles.

@johnf817 5 жыл бұрын

@@whatbizarreactisthecaninep791 idiot.

@johnf817 5 жыл бұрын

An electric arc furnace

@Rsenior1981 9 жыл бұрын

I hop you don't mind, but I would like to make a request. The "artistic" camera movement is quite distracting (not to mention nausea inducing). Would it be possible to hold the camera still?

@PiercingSight 7 жыл бұрын

4:53 - I love how he's holding the iridium directly in front of the Ir box on his tie.

@behrensf84 5 жыл бұрын

So if we could mine asteroids and iridium became cheap like steel, what uses would we have for it?

@sherriecaskie3111 4 жыл бұрын

Turbines for jet engines?

@kingofcobwebs 11 жыл бұрын

You guys make chemistry even more awesome. Thanks.

@Asurael 11 жыл бұрын

My dream has always been to have an iridium sword, and since iridium is mostly found on meteorite crash sites, you could call it a meteor sword.

@Theduckwebcomics 8 ай бұрын

Though you get more iron in meteorites 😅 And steel is actually harder than Iridium

@Snyper1188 4 жыл бұрын

That is truly an astonishing amount of iridium in one place, let alone one piece! Thanks for making this video, as this will probably be the most iridium ever viewed by the masses, in one place, in the world.

@S.R.Crnt. 3 жыл бұрын

These videos will never stop being interesting.

@inquizative44 8 жыл бұрын

He has a scientific hair do. If there was a picture of a scientist in the dictionary, his picture should be there.

@ChoppingtonOtter 8 жыл бұрын

your absolutely right! 😁

@somefool6409 8 жыл бұрын

What about his absolutely right?

@sliceofgarlicbread6868 8 жыл бұрын

Honestly, it kind of annoys me that people always imagine scientists having hair that looks like they were just struck by lightning.

@inquizative44 8 жыл бұрын

Just Multiply You have to find more important things to be annoyed by....lol!

@sliceofgarlicbread6868 8 жыл бұрын

inquizative44 You have to find more important things to point out!

@MonaichFother 4 жыл бұрын

6:06 Serves the dinosaurs right for all standing in the same place.

@greggles1987 11 жыл бұрын

love your videos. As a chem eng student, its nice to have a constant reminder that chemistry still kicks ass!

@johannsebastianbach7846 4 жыл бұрын

This guy is the personification of science.

@BlackAlpha1 8 жыл бұрын

Awesome tie!

@loeloeler 9 жыл бұрын

I feel smart watching this

@Energy-Alchemy Жыл бұрын

In addition to this obviously wonderful, and informative video, let's just talk about his phenomenal periodic table tie for a minute...this guy is the best!

@hybridoug 3 жыл бұрын

I love your videos! Thank you so much for teaching people about these elements.

@KingPeaceus 9 жыл бұрын

So what you're saying is... Jet fuel can't melt iridium beams?

@theq4602 8 жыл бұрын

+Donald Neal jet fuel burns at 4000 degrees F. Steel melts at 2500F

@U014B 8 жыл бұрын

But can laser beams melt iridium bars?

@peanuts2105 8 жыл бұрын

+David Vermillion yes, but steel loses half of its strength at 550°c

@theq4602 8 жыл бұрын

peanuts2105 I know right? The whole myth of "jet fuel can't melt steel" is bull. Why do they need extremely expensive nickle based alloys for jet engine turbines if jet fuel can't melt steel? I know they compress the air for more performance therefor higher temperature but science should be looked at first before idiots spout conspiracies.

@JohnyAngelo 8 жыл бұрын

+David Vermillion Its not about melting, but about the fact that steel loses half of its strength at about 600C. Thats why like in buildings, you often have some sort of fire protection on steel pillars, because in event of fire, they would heat up, bend and collapse.

@becton98 9 жыл бұрын

What do you melt iridium in?

@undefinablereasoning 9 жыл бұрын

Andrew Lee I haven't been able to find a crucible made out of that material.. The only crucible I've been able to find thus far that could probably safely handle Iridium is Magnesia Stabilized Zirconium Oxide (ZrO2) Zirconia. It has a maximum working temperature of about 2500 Celcius and a melting point at over 2700 Celcius

@lachlanallen341 9 жыл бұрын

Andrew Lee *shakes fist* Use metric/SI units or DIE!!! : P

@undefinablereasoning 9 жыл бұрын

zZDaGermanPhilZz Hi, are you sure the stuff can be molded into a crucible.. Again I have not been able to find a crucible made out of that material. I am not questioning the material's melting point.

@zZDaGermanPhilZz 9 жыл бұрын

undefinablereasoning I'd imagine so yes but I have no solid proof of course...at least it can function as a caoting for different metals to make them more heat resistant :P

@krappa 9 жыл бұрын

becton98 graphite crucible

@621pw 2 жыл бұрын

When he held the grains for the camera, the Iridium symbol on the tie was visible through the canister; not by accident I'm sure! Great videos!

@aleramone23 11 жыл бұрын

Thank you proffesor, i was always intrigued about this rare metal. Now i just love your videos a lot more.

@Galejro 9 жыл бұрын

1:36 Naaaaaahahhhh My man! :D BTW Make Irridium dumbbells and trick professional weightlifters on April fools day XD Yeaahh that's just a 200kilo wight XD

@tomdavies6256 9 жыл бұрын

Yeah that would be funny! "Hey go lift that 5kg weight." (Actually weighs like 50) "I cant dude" "ahh you weakling" . Hahaha I can imagine it already!!

@stagdragon3978 9 жыл бұрын

Tommy Davies OH! to add to it you lift an actual 5kg weight, "see, no big deal!" and just leave them with the Iridium one.

@thatretrocattt 6 жыл бұрын

The shot of science XD

@V-for-Vendetta01 4 жыл бұрын

That would be expensive

@hexagonist23 3 жыл бұрын

That dumbbell would probably cost millions of dollars.

@Y0uGuysAreTh3RealHer0es 4 жыл бұрын

Now I need an iridium sword for the zombie apocalypse.

@dsandoval9396 4 жыл бұрын

Ya damn right!

@sockosophie3132 3 жыл бұрын

Bad Idea cause of its heavy weight.

@fydstar 2 жыл бұрын

Love these videos, been binging them this week or so! That Iridium bar is worth £667,000 as of 28th June 2021!!

@psswamykal1042 2 жыл бұрын

How can check original or duplicate, iridum metal

@electoralex9726 2 жыл бұрын

Live long and prosper, dear Professor! We all love you!

@johnhanley9946 4 жыл бұрын

Iridium was once used to make the tips of fountain pen nibs.

@clarkelliott5389 4 жыл бұрын

A number of them are coated with osmium as it is even less subject to wear.

@Tindometari 10 жыл бұрын

I'm inferring that Dr. Poliakoff likes his vodka. :)

@ke6gwf 4 жыл бұрын

I think the camera guy likes his vodka too, judging by the drunk camera work lol

@komreed 8 жыл бұрын

I cant believe there are people that don't subscribe to this channel, never would be able to see this apart from this youtube channel. awesome

@LaGuerre19 5 жыл бұрын

Can't mention iridium without mentioning the K-T boundary. Thanks for another great video!

@jacobryan365 8 жыл бұрын

2:37 wow this metal is so dense that every ounce weighs 800 pounds

@regality7764 7 жыл бұрын

what?

@davidpham4709 7 жыл бұрын

800 pounds as in the currency

@ieatgarbage8771 7 жыл бұрын

And it's getting heavier

@bottleofspringwater1 7 жыл бұрын

or about 1040 dollars

@gumball1216 7 жыл бұрын

It was a joke guys. I'm pretty sure he knew.

@jeffw1267 7 жыл бұрын

I understand that iridium has a very high melting point (about 4400 degrees F). But why not make crucibles out of rhenium instead? It's much cheaper, it's essentially inert, and has a melting point of a whopping 5700 degrees F.

@OsirusHandle 2 жыл бұрын

It and iridiums price flux significantly by their demand and at one point in 2008 rhenium was significantly more expensive. Unsure about chemical properties that would favour one over the other though.

@Jotto999 11 жыл бұрын

Part of the charm of this channel is just how intensely stereotypical of a scientist Professor Poliakoff is. Brilliance, a massive pool of knowledge, and white Einstein-esque hair - it gives a sense of both respectability and cuteness at once.

@soren81 11 жыл бұрын

What an amazing element. Great video!

@190055joe 9 жыл бұрын

t still intrigues me how they were able to identify the different elements and then put them on the periodic table according to their atomic mass.

@JetFalcon710 3 жыл бұрын

There were other factors (reactivity etc.), but yeah

@Negs42 2 жыл бұрын

It's not arranged according to atomic mass, but atomic number. It's easy with X ray crystallography.

@GewelReal Жыл бұрын

@@JetFalcon710 nazi

@masterchief5603 4 жыл бұрын

What if I forget a element in periodic table!.. Nooooo- Oh my tie, *You saved my life!*

@joethebassplayer 4 жыл бұрын

Thank you for sharing your knowledge... I am not an "academic mind" but not for lack of my desire. I want toreturn to school when I can and study history or chemistry... I appreciate your time and sharing it with "us"... Thank You again - Joe

@BradSchmor 2 жыл бұрын

For anyone curious.. as of October, 2021: Iridium has a spot price, per troy ounce (31.1 g). So this 3.8 kg (122.2 troy oz) bar is worth, approximately: - 4900 USD/oz = $600,000 - 3560 GBP/oz = 435000 GBP - 4233 EUR = 517300 EUR

@psswamykal1042 2 жыл бұрын

I have one metal bar in my custody. I diceide to sell.?

@ianedmonds9191 7 жыл бұрын

I have a question. Why is it the science faculty of the University of Nottingham is so active on KZfaq with some really amazing content but you don't really see any other similarly focussed technical universities doing the same thing? I did my computer science degree at DIT->Abertay. It was a great technical college and then for computing at least a great university. They should be doing the exact same sort of thing as you guys. I had some amazing lecturers that should be doing this sort of thing. I'm thankful you guys are doing this but I guess I wish others were following your example. Thanks. Luv and Peace.

@laxpors 10 жыл бұрын

There sure is a lot of Iridium on pandora!

@ptroinks 6 жыл бұрын

I thought that was Unobtainium...

@uristmcdwarfington8863 6 жыл бұрын

wrong pandora, op is talking about the pandora from borderlands (videogame series)

@ptroinks 6 жыл бұрын

Ah, ok.

@kaffohrt9858 6 жыл бұрын

It's Eridium

@wormball 6 жыл бұрын

no, it's 55 Pandora

@Shkunk1 4 жыл бұрын

I really enjoy these videos.

@danieldan6034 4 жыл бұрын

The best chemistry videos.

@AluminumHaste 7 жыл бұрын

You could also use a Tunsgten crucible, which has a melting point of over 3000C and it's really a lot cheaper.

@LucasRodmo 7 жыл бұрын

AluminumHaste Sometimes is a question of durability too. The tungsten in a light bulb doesn't last much

@sebastiandiazmarulanda3919 7 жыл бұрын

iridium is much more inert

@AluminumHaste 7 жыл бұрын

Lucas Rodmo we're not talking about a thin filament, but a crucible made from it with thick sides.

@dphorgan 5 жыл бұрын

@@LucasRodmo What's that got to do with anything? Obviously a crucible is going to be a lot thicker and a bulb filament.......... People trying to act smart lol

@LucasRodmo 5 жыл бұрын

@@dphorgan Actually not. Search online and you will understand why this matter. Tungsten is brittle in high temperature, this is why NASA never used it in their heat proof exterior components. They are the scientists, if they are using iridium in this case, is because is the more appropriate.

@farstar31 8 жыл бұрын

5:35 My favorite line from Professor Poliakoff so far!!

@charlesearle8414 7 жыл бұрын

Iridium is also a common tipping material for fountain pens. Most pens with nibs made of gold or palladium are tipped with iridium to avoid wear.

@PiercingSight 7 жыл бұрын

Well, sort of. It's rarely actual iridium. If they use any similar metals and alloys, they like to call it iridium anyway, even if there isn't a trace of it. Something I find highly annoying.

@BavonWW 4 жыл бұрын

Great tie! Great hair! Even greater and informative video clips.

@lakse123 8 жыл бұрын

I bought a piece of Iridium because it's neato wow. Tiny shiny blob, $200US and weirdly heavy for its puny size. It is incredibly hard and inert and resists everything I do to it. From what I'm told, it'll look exactly the same 1,000 years from now. Freaky stuff.

@dphorgan 5 жыл бұрын

Ah ya.... Same with gold and platinum..

@jupiter_ios 2 жыл бұрын

@@dphorgan and osmium

@DJPsykhe 11 жыл бұрын

vodka glass hee hee xD I love the professor!

@chauhanrajput4733 4 жыл бұрын

Thank you Sir full respect. It would be amazing if I get a chance to meet this person practically.

@RincewindIsMyHero 11 жыл бұрын

More like this please (showing the uses of certain metals, etc.)

@ghostman9028 8 жыл бұрын

"This man is cool as a polar bears toe nails!!!"....

@theartificialsociety3373 7 жыл бұрын

So what is crucible from which the iridium was made? There must be an ultimate melting point solid.

@matthewgranstrom1579 7 жыл бұрын

Ceramic crucibles don't melt.

@theartificialsociety3373 7 жыл бұрын

+Matthew Granstrom so why do you need an iridium crucible vs. ceramic?

@Enny_Gima 7 жыл бұрын

For certain crystal-growing applications [as said in the video]. There are some experiments which require iridium crucibles for this purpose, as ceramic will not work for growing some crystals.

@theartificialsociety3373 7 жыл бұрын

+Enny Gima yes I imagine there are special uses for it. Probably the jet engines or rockets would not be nearly as reliable without these very exotic special metals.

@ColonelSanders17 7 жыл бұрын

you can use tungsten, that has the highest melting point of all pure metals.

@marth6271 4 жыл бұрын

The iridium aint the only rare element there.....you ar3 a rare individual. Thank you so much for shareing your knowledge, and your enthusiasm.

@lukanikic4950 10 жыл бұрын

amazing as always

@Tindometari 5 жыл бұрын

Now, that's heavy metal ... "I AM IRIDIUM MAN!"

@ChargedTTq 10 жыл бұрын

I'm pretty sure the spark plug tip wears more due to the plasma arc than the combustion.

@davidringer4816 4 жыл бұрын

Love you dude man you make learning way to fun

@caroline61804 4 жыл бұрын

Love your show!

@old-bitprogaming4857 7 жыл бұрын

Imagine hitting somebody with that rod, that would hurt alot

@Spycyzygy 7 жыл бұрын

pretty much anything denser than foam will hurt tho

@Tindometari 5 жыл бұрын

"I AM IRIIDIIUUUM MAN!"

@hadrock83 11 жыл бұрын

Now to the junker to get me some spark plugs :). Im gonna be rich!

@duckdodger2464 8 жыл бұрын

i love welding iridium. it is by far the craziest thing i have ever welded. To crank a welder up to 350 amps floor the pedal and not blow a hole through 1/8 inch thick of metal is outstanding.

@filg9 4 жыл бұрын

I have chilled vodka waiting anytime he’s in town. Love this guy!

@jaimegomez9658 8 жыл бұрын

iridium killed t-rex, Damm you space!

@daniescott3000 8 жыл бұрын

If the T-REX was still around, we'd never be here.

@jonhohensee3258 7 жыл бұрын

Got proof?

@HobzyMcRuse 4 жыл бұрын

@@jonhohensee3258 a thin layer of iridium rich rock formed when the asteroid that killed the dinosaurs slammed into Earth, 65 million years ago. It's called the KT boundary.

@jonhohensee3258 4 жыл бұрын

@@HobzyMcRuse - That's evidence, not proof.

@HobzyMcRuse 4 жыл бұрын

@@jonhohensee3258 It's fact. The KT layer of iridium can only be formed from a massive meteorite impact. The age also coincides with the age of the massive chicxulub crater. Maybe the dinos were in decline but this was the final nail in the coffin. No dino fossils can be found above this layer. You won't find better scientific proof.

@GMCLabs 10 жыл бұрын

I named my daughter Iridium. Iridium Crystal Carone!

@Samhaiine 11 жыл бұрын

The Professor's tie is plain awesome!

@Flumphinator 10 жыл бұрын

My favorite fountain pen has an iridium nib. Writes great.

@kiryukazuma8089 8 жыл бұрын

Imagine a sword made of this metal, or a work hammer

@Outland9000 8 жыл бұрын

+Ian “Worldbreaker” DeNault Too heavy.

@MrDeathsmbrace 8 жыл бұрын

+W3rking W0nders It's called "Mjolnir", I know you wrote that two months ago but I had to. :p

@LucasRodmo 7 жыл бұрын

Ian DeNault Too heavy. Steel is fairly light weight and resistant enough for the job.

@camerongray7767 4 жыл бұрын

My mom saw me watching this and thought that his hair was a joke

@rud 4 жыл бұрын

Nice shot. Iridium in front and the symbol and number on the tie.

@Funzelwicht 3 жыл бұрын

Very nice information, thanks!

@superstrudel 10 жыл бұрын

nice. Stop moving camera, please.

@michalchik 9 жыл бұрын

NOOOO!!!! HE just said "Its density makes it very hard and rigid". Hardness and Density are independent properties.

@CastelDawn 9 жыл бұрын

he never said that they weren't independent. don't blame your poor comprehension skills on him.

@michalchik 9 жыл бұрын

OK, you can not comprehend that stating that A leads to B logically requires that when A is present B be present. Lead is considerably denser than steal but steel is harder than lead. Mercury is even denser than lead and it is a liquid.

@terrymadill 9 жыл бұрын

michalchik I'm sure the prof misspoke.

@michalchik 9 жыл бұрын

Terry Madill You are probably right. Its just that I try to teach how these propertie are seperable to my students so i get weirded out when authority figured screw it up.

@joshuanorris5860 6 жыл бұрын

Youll get over it

@Pile_of_carbon 11 жыл бұрын

That tie is awesome!

@haslymazo1542 4 жыл бұрын

Professor thank you for your knowledge

@SparksThePhysicist 8 жыл бұрын

my cat's name is iridium

@drcrowley7526 6 жыл бұрын

DrVonschnit ah a cat, the ideal pet for a James Bond villain

@naiknaik8812 5 жыл бұрын

That's one hard cat.

@jesusfrreak2 7 жыл бұрын

is anyone else thinking captain america shield

@WAMTAT 6 жыл бұрын

Vibranium

@Worsthoofd 7 жыл бұрын

The bar in the beginning of the video is a significant portion of the yearly world iridium production (a few tonnes).

@Imkrhn 4 жыл бұрын

That 3.8kg bar is 134oz is £107,000 at the time

@Paralars 7 жыл бұрын

800 punds per "ounce". How very scientific

@manheap12 7 жыл бұрын

Paralars I don't understand. Metals are measured in Troy ounces. So it makes sense.

@Paralars 7 жыл бұрын

It would probably be easier to get a grasp for the price of Iridium if it was stated in pounds per gram or kilogram, since that's the unit a chemist/scientist would probably use

@jmowreader9555 7 жыл бұрын

A metals dealer anywhere in the world sells precious metals like iridium in troy ounces.

@amrdaoud4254 6 жыл бұрын

Paralars where do u sell

@CineMutt 4 жыл бұрын

This kind of closeup is called a “choker.” It is very unpleasant and inappropriate to the purpose of this video.

@Geeksmithing 11 жыл бұрын

What are the crucibles used to pour molten Iridium made out of?

@MrGoatflakes 11 жыл бұрын

I am constantly amazed that something several orders of magnitude rarer than gold and tricky to isolate and purify and melt is as cheap or cheaper than gold.