"Warmth coming in the middle of the heart. The other heart doesn't do anything." I feel your pain bro.

@susanlansdell863

7 жыл бұрын

Lance Everett

@isaacfulton7731

7 жыл бұрын

deep.. lol

This was heart warming.

@Y-0

7 жыл бұрын

bob hoo cers get out

@opl500

7 жыл бұрын

hur

@benjaminlehman3221

7 жыл бұрын

bob hoo cers ha. Corny joke. I like it.

@scrowlerhouse

3 жыл бұрын

carefully, he's a hero

Nice molecular modelling! Great demonstration of the energy required to break bonds and energy released when bonds form.

@huawafabe

7 жыл бұрын

is he using snatoms?

@jens684

7 жыл бұрын

Fabian Huber Yes, indeed.

@Amzide

7 жыл бұрын

The creator of those must have been a real shrewd fella!

@2450logan

7 жыл бұрын

Didn't expect to see you here haha

@alaahajhussien1968

7 жыл бұрын

First Vsause gets involved in the channel, now Veritasium......... is this where the cool kids hang out?

Metal disk works by creating a small gap in the perforated grooves of the disk, which in turn provides the environment to create a nucleation site. You can tell if you have one of these, because the perforations on the disk become increasingly separated to the point where only light pressure initiates the phase change, and you don't have to totally invert the disk.

@UberAlphaSirus

7 жыл бұрын

Quentin Lightner thanks, that was the missing bit i wanted to know

@hi_im_angelatrainor

3 жыл бұрын

Where do I get disk?

@Qman621

3 жыл бұрын

@@hi_im_angelatrainor from inside one of those cheap reusable click heat packs. I don't know how they manufacture it but it doesn't seem too difficult to make. Sorry I don't know what it's called exactly or how you might get a lot of them but salvaging one from an existing product is any easy way to get one if your trying to DIY your own heat pack

Thermal imaging proves that Brady is one cool dude.

@jasondoe2596

7 жыл бұрын

TheAtheistPaladin He's got a cool nose, at the very least!

Outstanding video! It would have been great to cut open one of the hearts and take a close look at the metal disc.

I requested this video, thank you. sodium acetate is incredible to me, ive made sodium acetate trihydrate a few times its just to feel ice at a physically hot temperature

Great to see Dr. Bowley again! I love this series so much and all of the enjoyable and personable scientists who spend their time with Brady to teach us in a totally new way. Cheers!

4:06 "So that's what you have to do to finish it off: Just put it in there, leave it for a little while - you take it out and let it relax" A strangely accurate description for many different situations in life ;-)

@mckenzie-grayeevans5876

4 жыл бұрын

XD

Another great video! I would like to request more video's on how science & chemistry can keep you warm this winter.

Feels like forever since Prof. Bowley was in one of your videos. Great to see him back! Loving the footage from the thermal camera. Maybe a video on how they work and what limitations they have would be a great topic for Sixty symbols? (Hint hint) You would already have great footage to use, so besides talking to a professor, editing, possibly animating and uploading, the video practically makes itself!

wow Snatoms !! Thank you for supporting Derek guys and I honestly think he really nailed it with this product !

So excellent to see Prof. Bowley back, but I'm surprised at how little air time he got. Always enjoyed his videos from before he retired. Hope there's more from him in the future!

Excellent explanation

really like the thermal imaging camera. makes watching boiling water interesting. idea: put ice/dry ice/liquid nitrogen into boiling water and see how it looks under thermal imaging.

Very interesting video, the thermal imaging makes it even more captivating !

always look forward to seeing these videos

those video with the thermal image are great !!!!

Nice to see Roger again!

I really love the thermal imaging!

My 8th grade science teacher had quite a few of these, only much larger. He played on an ice hockey team and needed then in case of injury. The really neat thing about large hot ice packs is that they conform to the shape of the body part and the crystals help hold it in place, so you don't have to worry about it slipping out of place if you wrap some tape a compression wrap around it before you get up and move around.

Good to see Roger again, even if for just a minute. Is he willing to do some more videos?

I love the thermal camera

very well done video! thx

so heartwarming

I already knew this one! ;) I have 2 of these packets (blue, pillow-shapes). I was so intrigued by their properties that I had to look up Online what solution was inside and how the reaction worked. First time I ever saw something like these, were in military, back in '03, where we had both _warming_ and _cooling_ packets to treat different injuries.

Yey brighten up the crappy Monday with another video :)

Great video! thanks for sharing!:)

it's so cold outside here on the east coast, I will go buy me some hand warmers today. love this vid Cuz I always wondered about this.

i always was wondering how they're work. I know it's the crystal structure forming. thanksfor the info!

Eee, it's good to see Prof. Emeritus Roger again as well! I had no idea sodium acetate was so ubiquitous (yes, I was intrigued enough to look it up). And yet, we don't hear much about it.

I'm definitely going to look out for this item in the stores during this coming winter.

@chraman169

7 жыл бұрын

+Nicholas Hylton In summer they are cheaper. Buy and store.

I love all your channels Brady, but its always especially nice to see more periodic videos! I'm curious, do you expect to get more videos out in the near future?

@jonathanschossig1276

7 жыл бұрын

Make it happen: www.patreon.com/periodicvideos

It's a "supercooled water instantaneous freezing" phenomena. Super clean water that is cooled to a freezer temperature needs just a nudge to start crystal forming chain reaction (which is not a chemical reaction but a physical process). Same here: pressing on the metal pushes random two particles together, forming simplest possible crystal seed and chain reaction like process forms precipitation around this crystal seed.

Look how cool Brady looks in the outro.

That type of handwarmer is quite nice as it's re-usable. In one of the local shops they sell a type that from memory is made of fine iron dust and coal. Not sure if there's more to it. Seems to generate heat from oxidation quite simply. Each pack is single use and is stored in a sealed plastic bag. Quite nice and relatively safe and a couple of hours.

This videos was... heart warming :D

I have 8 of these and I take four out while cycling two in my gloves and two in my sleeves in winter and put 4 on my pillow before bed when it's really cold. Really like the Chemistry in these little things XD

I think clicking the metal disc causes the solution to cavitate.

@periodicvideos

7 жыл бұрын

interesting

@wupme

7 жыл бұрын

and thats what i recall too. A small cavitation thats enough for nucleation to start.

@Thefreakyfreek

7 жыл бұрын

Ben Adams that's why it snaps just like the pistol scrimp aterwise it was single use only

@testthewest123

7 жыл бұрын

Yeah, if it released particles, those would stay in the water and would inhibite the solution to ever be oversaturated.

@Qman621

7 жыл бұрын

This was actually quite a mystery to me as well, and I think I have figured it out. Can't remember which website I read it on, but one of the companies that made this said that the metal disk has a lot of tiny grooves in it that are perforated. When the disk is inverted, the perforated grooves separate slightly; creating this cavity that you mentioned.

The chemistry, as always, was fun and enlightening. I was even more interested that hand warmers were a thing. Not a big item where I live!

Professor Bowley, Great to see you again. Is this new video or are we seeing you via a time machine?

That's pretty cool!

Awesome. never seen one of those, cuz I live next to a desert... but still awesome.

I Love these videos

That metal disc does not release anything. It just creates a shockwave that propagates through the solution. That's enough for nucleation to occur. Remembe that when you have superheated or supercooled water, you also just need to tap the glass to induce state change.

@ZakKohler

7 жыл бұрын

kasuha that what I was thinking as well.

Fantastic footage. That camera is amazing. Brady ... question ... i couldn't help but look at the scale to the right. Seems like the camera footage is interlaced, but the scale isn't ... or vice versa?

I bought a hand warmer like that back in the early '90s. Now when I hear about them or see videos about, I think more about the super-saturated solution, and how that relates to cooking, specifically candy making.

Professor Bowley!!!!!! I missed him!!

That so cool!

I'm not finding a price for that camera on Flir's website, but the site says it's research-grade, and elsewhere I found a similar model number listed at $40,000. The optics are f/1.2 or below (depending on focal length), which is impressive too.

Nice!

Greetings professor. Hope you have a great day. Btw im currently studying organic chemistry. What is your experience with that?

I'm pretty certain the solution is simply a supercooled sodium acetate solution, the little metal disc provides a point of nucleation when bent. Allowing the solution to "freeze" at ~60c (the freezing point of sodium acetate)

I actually did this experiment in lab but never touched the test tube. The way to get sodium acetate crystal is intriguing because acetate is uncommon since acetic acid is weak and won't disassociate easily. Thats why I think sodium hydroxide is used, but in my experiment we used sodium carbonate!

THAT is a PHENOMENAL shirt!

It's also fun to pour out and make into towers and other things as the super saturated solution crystallizes as it hits the already poured stuff. Do that with the thermal camera. :)

You looked pretty cool in that outro

:O didn't know such things exist, I definitely need to get some of these for ice fishing.

Nice to see Prof. Bowley. o/

Anotherbgood one.

Those metal discs don't release anything. They create shock wave (high pressure area) that initiate crystallization. The same effect you have with very cold beer when you slam it hard against the table. Notice the second heart at 1:28 there are 3 areas where crystallization was initiated.

I was taught that the crystallisation starts as a result of the shock wave caused by the clicker. I'm going to have to look into this.

@BooBaddyBig

7 жыл бұрын

I think the clicker cavitates the water, in other words it creates a low pressure area which would contain water vapour due to the low pressure in the shockwave, and there would be a powder of sodium acetate left behind to catalyze the crystallization.

@joshuarosen6242

7 жыл бұрын

BooBaddyBig I do think that's a reasonable theory but I did, as promised above, look into this and I have really struggled to find an authoritative answer to this. The theories seem to be seeding from particles of sodium acetate or iron given off by the clicker (I am highly sceptical of this explanation), your explanation or the shock wave from the clicker pushing atoms into sufficient proximity to form a crystal. However, look as I might, I cannot find anything more than reasonable opinions and not real research. If anyone knows of any, please tell.

@JehuMcSpooran

7 жыл бұрын

I've always thought it was a shock wave rather than cavitation. The first heat pack I brought said to punch it to activate it and it did not have a metal clicker in it. Also the instant frozen drink trick uses a shock to start the rapid freezing.

@ZsaZsaUmbra

4 жыл бұрын

I prefer all of the theories here over "a piece of sodium acetate gets clicked off the disk." Especially because the end of the video basically says that couldn't be possible.

Nice rolex! #PeriodicWatches

professor plz be making a video on neutrino...🙂

Your wedding band is the coolest!

Since you have rather nice thermal camera it might be nice to show this same effect with the bang a bottle of supercooled water on a desk to make it freeze instantly, that should also warm up as it freezes but not as much.

Sodium Acetate is also the flavoring agent used in salt and vinegar crisps. It is also fairly easy to make at home using distilled vinegar, distilled water and baking soda.

@googleeatsdicks

7 жыл бұрын

you don't necessarily need the distilled water

@UberAlphaSirus

7 жыл бұрын

Anticonny you might as well use it if your making one of these

I thought this was going to be on the air activated handwarmers. Would be neat to see another video on those.

quick question: could you use this chemical system to capture energy from the surroundings, and if so then how efficient would that be ?

Wow Derek's snatoms

@MrAntieMatter

7 жыл бұрын

Expensive though.

@jasondoe2596

7 жыл бұрын

MrAntieMatter Haha yeah, loved the jab!

@mylesbishop1240

7 жыл бұрын

Jason Doe haha yeah, I missed that

May we have a video on Grignard's reagent next?

The thin metal disk that triggers the chain reaction actually has tiny fissures throughout it. The disk is stamped out a thin piece of metal and these fissures are created by stamping the metal disk hard enough so that it superficially tears the surface of the metal. Some of the sodium acetate crystals get trapped within these microscopic fissures and pressing or bending that metal disk causes a release or exposure of the crystal(s). It is a supercooled solution.

This is cool :)

This reminds me of an experiment with clear water where you cool it down but it doesnt freez up. Then you drop an impurity or just hit the side of the vessel to create vibration and the water inside freezes .... well ... something along these lines. : )

Brady you are so cool (compared to the hearts at least ;)

were those veritasium's molecule magnets you were using?

sodium tiosulfate disolves at 55c and if not shaken can be chilled down to below room temperature. undercooled sodium tiosulfate acts the same way. temperature raises to its melting point. ref to supercolled liquid.

@lajoswinkler

7 жыл бұрын

There is no such thing as sodium trisulfate.

@martinsmithtimes637

7 жыл бұрын

Lajos Winkler my bad fixed typo its tiosulfate... comonly used as fixative in b/w photography rendering process. the other interesting property dechlorination of water.

Is sodium acetate solution ever used for cooling systems? Although liquid metals seem to be used sometimes, nothing has the sheer heat capacity of water, and I'd expect that transfer of heat is much faster if you can use the sodium acetate to keep the temperature gradient high; while absorbing heat from machinery that needs cooling, the solution will keep itself cool for a while rather than quickly reaching near-equalibrium, then when releasing heat out into the environment it can spend much longer being much hotter than the environment using the sodium acetate.

Can you do a video on Flameless Ration Heaters for MREs? Add water, and it heats your food.

Do you tune those thermal cameras to a certain range?

I have a question here.On April 17th 2009 you made a video about erbium and you said its a nuclear poison , can i use it in building constructions in order to protect it from nuclear explosions?

Are those Derek's (Veritasium) Snatoms?

does the clicker have to release a particle to form a nucleation point? in just thinking about when you hit a bottle of supercooled beer or water and it freezes because of the shock

Would hitting the surface quite hard (not hard enough to break it!) work as well to start the nucleation?

could you guys show everyone floroantimonic acid? or mention it in a video because that stuff is crazy

Do a video about fluoroantimonic acid and show a demonstration.

I knew about the ones that use a rusting reaction to produce heat, but not this one

@kirknay

5 жыл бұрын

Hothands and others that use the rust reaction typically last a little longer, but are one time use. These can be boiled to reset.

can you guys make a video about Sulfur hexafluoride and if it's possible to make it into a liquid using nitrogen like you did with thee oxygen to liquid oxygen?

it was my understanding that it is the shock wave from the clicker that set of the reaction that crystallizes the solution. am i mistaken?

Didn't know these were things, sound interesting though.

love seeing mr. bowley! how is his retirement going`? i hope he is well :)

This behaves like a super-cool solution. Water will do the same thing. If you are careful you can cool pure water to well below zero degrees. Then if you give the water a slight bump, or there is a tiny particle in the water, the entire container will freeze almost instantly. This process generates heat warming the water to zero degrees. Is this process the same thing, but with something with a higher freezing temperature?

So is there a chemical reaction that's releasing heat or this crystalization isn't a chemical reaction?

Ahhh sehr intersante

*BAD PUN WARNING* 4:45 : Brady, you are so cool there!

luff you martin ^_^ you are my true senpai

I heart your videos - or is it heat?

Materials Science terminology: A nucleation site starts the crystal formation. This is the same reason boiling chips are used.

One time, the package buried in the microwave(I was trying to revert it) and I didn't think of it, but after awhile, there was a white, powdery residue that smelled very similar to salt and vinegar chips.

How can those degrade over time? I had some of them and after a about a year they never turn quite clear again after boiling them up. They will still activate and produce heat but they somewhat stay crystallized.