The Sound of Freezing: Explained!

[@PracticalEngineeringChannel]

Awesome video. Such a great explanation and really nice clips from the freezer. I have been wanting to make a video showing the degradation of concrete from cycles of freeze/thaw. Whenever I get around to it, I'm going to need to remember these lessons about filming in the freezer!

[@AlphaPhoenixChannel]

ah i was totally going to add a joke about cracked pavement in Ohio and i forgot! this is like freeze-thaw cycle occurring inside the ice... good luck with your eventual filming!

[@erictart4225]

​@@AlphaPhoenixChannel perhaps the high pitched sounds are the result of a rapidly growing crystal lattice that traps previously-dissolved gases. Ice would encircle trapped pockets of air, and press inward to due to the expected increase of volume of frozen water. The overpressure of air bubble crystal inclusions in ice is a well studied phenomenon, although your interest in sound might be ... unique. I would expect the individual "blips" of sound to be the shockwaves caused by stress fractures created when ice encircles a pocket of water that hasn't ejected all of its enclosed gases out of solution. When gas leaves solution, the volume is expanded many fold, and if there's nowhere to go ... the gas is gonna crack open the surrounding ice structure to relieve as much pressure as it can. I would not be surprised if the dendritic growth pattern allows a relatively uniform statistical distribution of air bubble sizes and thus the compressive stress to sound effect picking up what looks like a quite short range of frequencies. Now I want to see the effect of degassing, and if that can explain the different crystalline growth patterns.

[@harriehausenman8623]

Hey Practical Engineering, why don't you also come over to odysee. I've got some LBRYs waiting for you :-)

[@HafCoJoe]

I just noticed you posted here Grady! It's awesome to see you both know each other's channels!

[@Kycilak]

@@erictart4225 Isn't the water already degassed as it is cooled by evaporation in low pressure?

[@AppliedScience]

KZbin should have recommended your channel to my years ago! I only found it now because of a suggestion from Breaking Taps. I really really liked your explanation of dendritic growth, as I have never really understood it that clearly. Thanks so much for making these videos. Also great to see UCSB again as a fellow Gaucho!

[@AlphaPhoenixChannel]

Hey! Great to have you here! By the way, I aspire to have a workshop like yours someday - your stuff is fantastic. I just got a text from somebody at my hackerspace that you gave a shoutout on twitter, so thanks a bunch! Discovery on KZbin is so difficult...

[@QuintBUILDs]

The Applied Science tweet brought me here! Apparently we need to go around the algorithm to promote education.

[@scott98390]

I'm also here from BreakingTaps!

[@fizzyplazmuh9024]

I am pleasantly surprised that Ben of Applied Science doesn't know literally EVERYTHING and there was something I understood that he didn't yet. He is literally a God of applied sciences. I can die with a sense of meaning now.

[@wernergraff]

Indeed very clearly explained! What I‘m still extremely curious about are three things: - why are dendrites developing symetrically (from same location to two sides at the same time)? - snow flakes seem to grow in air surrounded only be tiny water droplets. Can there still be the same mechanism at work? - why do snow flakes stay in one plane?

[@KingBaowser]

It’s funny cause I’m like of course it makes noise, but then I remembered it’s just movies.

[@AlphaPhoenixChannel]

ikr?!

[@andrechinazzo719]

maybe movie people got the insight from hearing lakes freezing? From a quick reach on youtube, this was the best video I found. You can hear both the crackling noise and the stars wars like sound that is also pretty cool. kzbin.info/www/bejne/nnevlXqXlLljbLs&ab_channel=WildlifeandNatureChannel

[@JayPixx]

THIS one od better ! :D Laser sounds. kzbin.info/www/bejne/rGSyaqmEnpKXoaM

[@denny9931]

I think everybody knows that it can make this sort of noise when reverting the process, like running warm water over a block of ice. Not the same thing, probably, but similar noise.

[@CaptCorgi]

@@andrechinazzo719 That is it ! I have lived next to a pond my entire life and have always known ice makes noises, And those are the sounds I was thinking of. Clearly its not exactly the same sound but lord does it make it make a bit more sense why I was like "yeah duh its gonna make noise" Literally I have never in my life reacted to a video's concept with more like "well duh" energy than this, I literally thought "well of course it would make noise" but then I thought about it and I was like "wait a minute why would that make noise, and why do I know it would make noise"

[@Pants4096]

Time to put a good ultrasonic transducer / hydrophone into a sound-dampened version of the experiment, and record with a few hundred kilohertz of bandwidth. Oooh! Oooh! Then take a wacky turn into left field and start pulsing ultrasonic energy into an ice-forming region. Would a pressure wave inhibit ice formation while a rarefaction wave would enhance it? If you could set up standing waves, would crystals form along the nodes?

[@einname9986]

I want to see this!

[@atomatopia1]

On top of this perhaps use a thermoelectric cooler to help remove the freezer noise from the equation

[@acefromwithin2079]

Yeah. Whatever he said.

[@Ryan-xc8uh]

I know you! We played TF2 like 10 years ago

[@duskpede5146]

@@Ryan-xc8uh small world

[@pafnutiytheartist]

The fact that quickly freezing water makes the sound that Hollywood lead us to believe is purely amazing. I thought for a little while on how did it happen (I really doubt that a lot of sound engineers actually heard this specific sound). I think I have an explanation. They were looking for the sound of ice. The only situations where ice actuality makes any sounds normally is when it cracks, be that by walking on it, or throwing an ice cube into a drink that's too warm. So yeah, cracking sounds makes sense. But I would have never guessed that this sound has any realistic and scientific merit to it. So cool

[@sailor5853]

No. They heard it. If you put a bottle of water in the freezer for the right amount of time it will be liquid, just waiting to become ice. That it out and tap it and it will instantly freeze and you will hear the ice.

[@kindlin]

@@sailor5853 Timing it right can work, but more reliably, you want to make super critical water that will freeze when you tap it or otherwise disturb it. Easiest to do that in a nice, clean container, and before you try and freeze it, boil it. This reduces dissolved gasses and subsequently nucleation sites. Probably does a lot of other stuff, too, but I'm no chemist.

[@justsomeguy5628]

This is the same sound as when an icecube is melted by water, likely for the same reason explained in the video, and it is very audible. Also, I have heard this from ice forming on house and car windows.

[@Vicus_of_Utrecht]

Or pouring water into a bottle partially filled by ice- crack crack. Speaking of Hollyweird fakery, the 'iconic' bald eagle call used ALLL the time in movies is a from a hawk. The B.E.'s call is a pathetic cry 😂

[@Vicus_of_Utrecht]

Cows don't look like cows on TV 😂😂😂 m.kzbin.info/www/bejne/gZPOf6iiadyEfpI

[@ahhuhtal]

Walking in a forest when it's really cold, you can sometimes hear loud popping noises coming from the trunks of trees. In Finnish this is called "paukkupakkanen", which translates as popping freeze. The commonly told explanation for this is indeed water expanding when freezing. Not sure if dendritic growth is occurring in the trees, or if the water gets trapped by some other mechanism.

[@MrMarapro]

I think it's just about the moisture freezing in the tree's structure and, as it turns into ice, expanding. The cellulose of the tree doesn't expand, so it cracks to relieve the pressure.

[@Muonium1]

A most excellent and thorough treatment. Though I've known the reason for water ice's hexagonal symmetry since high school (the 104° bond angle of the molecule), I've never seen a clear explanation of the dendritic growth mechcanism before. There's certainly a paper in this sound thing if one hasn't already been written.... The foley freezing sound is kind of understandable if you live in the North. You can definitely hear ice cracking in the forest after an ice storm or when you walk on a newly frozen lake the sounds are kind of similar but deeper. Also supercooled ice cubes from the freezer make related crackling noises when dropped into a drink from the thermal shock.

[@DampeS8N]

Thanks for the note at the end about this being an hypothesis. Too often people in popular science media perform single experiments and draw conclusions from them. Towards the end of the Mythbusters run they _tried_ to get away from that, but never completely successfully. It would do the science YT space well to always have this message in the back of their minds if not in the back of the videos.

[@AlphaPhoenixChannel]

the method is important! this is such a new explanation i didn't feel right ending without a disclaimer

[@khloros17]

I hate to think there are other amazing channels like yours that I will never get to watch cause youtube recomendations are plain dumb. Glad to have recently found you tho!

[@lukeshaffer3837]

As an ice fisherman we are very aware of the sound of freezing ice. I've had a few friends go running off the lake after hearing pressure cracking. Or the ice cracking under your chair.

[@KnowArt]

This would maybe something that Applied Science can help you with? he's a cool guy

[@QuintBUILDs]

Worked for me! 👍

[@vincenzomartorana2625]

You're gifted, man! The material is of high quality, your enthusiasm is engaging, the explanations are convincing. Keep on like this

[@HectaSpyrit]

That ultra-sound dendritic growth plot twist was amazing!

[@emilyrln]

Simply magical! It's been a while since I heard glass being scored by a diamond wheel prior to breaking, but that's what it reminded me of.

[@TheRanguna]

Such an awesome video, it's like a paper but in video form and much lighter. It has an abstract, literature review, investigation, hypothesis, limitation and can be served as a stepping stone to a follow up to another research. Just amazing!

[@lunaponta594]

this channel awakens something in me that makes me want to learn, and i enjoy how you explain and how excited as well you are to these new concepts i'm learning. you're a rare kind of person i can vibe with so well i could watch a full 30 minute video and i would enjoy it

[@kathvardoverher8999]

I recently discovered your channel, and it is one of the best on all of youtube. So surprised you don't have more views, but I really hope you keep it going, because I am enjoying it thoroughly. I have spread it to all my friends, because such high quality content deserves more attention!

[@AlphaPhoenixChannel]

Thanks for the comment and thanks for sharing! Trying to reach people is the absolute hardest thing - glad you made it here!

[@ViiKing_]

I don't remember how I ended up subscribing to this channel but I'm glad I did

[@jasond4084]

I heard water vapor crystallize in 1996 while wintering over at the South Pole. I first noticed it while relieving myself outside when the air temperature was below -75f. There was no wind so it was extremely quiet out. The noise was soft but sounded like the rush of water from a pressure washer. The unexpected sound made me stop and turn my head to see what was making the sound. Hearing nothing I continued only to hear the rush again. That’s when I realized I could hear the steam from my urine crystallizing. Later on in the winter the same phenomenon would occur every time the temp was around -75f. I’m assuming this would be different at sea level as we were at 9301 ft with a physo altitude of 12-14k depending on the day. At -103f when running naked from the sauna out to the pole and back I could hear the steam from my sweat crystallize as it passed my ears. We were basically leaving human contrails behind as we ran. I’ve always wanted to reproduce this effect in a freezer and get it on tape. Thanks for this vid!

[@MakerBees333]

Living in a cold area the loud cracking of ice is pretty commonplace, especially when ice starts to form on the inside of double glazed windows. Similar sounds can occur with rapid thawing probably for similar reasons. You need to be in the country to experience how noisy ice is, not unlike seeing a starry night sky without light pollution from nearby cities and suburbs.

[@nom6758]

Explained perfectly. Never heard anyone describe it using that model of supercooled water vs ice, the visuals were exactly what I was looking for.

[@robertmckinley2526]

This is actually one of the best videos I could imagine using to show non STEM interested people why getting involved in the nerdy gritty stuff in science can help you understand common events when you would otherwise just say "idk guess that's just how it works"

[@LaughsMicroscopicallyPL]

this is the first time I understood dendritic growth, thank you!

[@alan2here]

IPhone camera works well when lined up and balanced it on top of the microscope, you can see things better than looking down the microscope which makes the standard eyepiece approach kind of crazy. The resolution is good, the built in app goes up to 240 FPS for video, for still images I can recommend "ProCam" for straightforward, manual and numeric control of things like focus and exposure over a huge range. A bit of colour mapping afterwards can be helpful. Note that confusingly it can focus further away than infinity.

[@jannikheidemann3805]

Further away than infinity focus = negative focus The focal point is behind the camera.

[@crazygamer56]

I totally agree with you. The ice is trying to grown into an area where there is less than the 9ish percent required and breaking itself to make room. Very well explained!

[@beckymartin1810]

Fascinating. We stayed in a cabin right off the lake in Eagle's Nest NM. In the winter and the sounds of the lake at night will stay with me for a lifetime.

[@matthewperlman3356]

First off, excellent description of dendrites and their formation. Thank you for explaining that! I found your theory on the sound interesting and maybe you are correct, but personally I always thought that it was a result of that 9% expansion from water to ice crystal; where each individual crystal forms nearly instantaneously, but somewhat sequentially as a whole.

[@Dziaji]

I always figured that the freezing sound was from ice crystals cracking each other since ice expands as it freezes, but the explanation in this video is far more detailed and satisfying.

[@techwithvj257]

I don't know why such good videos and good channels don't get much subscribers and views..... ❤️ur work

[@J-W_Grimbeek]

0:20 real smooth pun there

[@1PoodleKing1]

This is so fascinating. The explanation of dendritic growth was really good. I had never thought about it that way.

[@MrSaemichlaus]

I've seen thermal cracking especially in welding aluminium. It cools quickly and it's soft. If your weld cools down too quickly, it can crack all along the centerline. You might not notice it because it's under the surface, so ultrasonic testing is the only reliable method of catching it. With slight mechanical stress, it will crack open and make for a bad day. This was some awesome research, and I learned something about metallurgy too!

[@bcnom]

Man your channel and this content is criminally underrated. This is an amazing video! Just discovered you recently but each video I watch is so high quality it's absurd. I'm ready to come back in a year and see you with 1M+ views per video.

[@visualchallenge2413]

I think there is a setup that will interest you : you can use a smartphone audio cable, uncover the small microphone inside, put a small plastic piece directly on the microphone then put a small drop of water. I think that when freezing you will hear very clearly the crackling sound of freezing. Concerning your own setup you can hear the sound very clearly if you use a microphone that you stick firmly on the the surface of the water container. As you know the sound passes much more easily between solids than through air.

[@XanTheDragon]

The algorithm smiles upon you today, traveler.

[@largestbrain]

the way he says vacuum is kinda satisfying in a way

[@illestvillain1971]

This channel will blow up some day and become one of the major science channels in YT.

[@ghall05]

Wow. Just when you think you have a tiiiiny grasp on anything to do with physics, there's always a deeper level to investigate and prove you wrong! I'm just now starting to understand that I DON"T understand ("truly" understand) anything about our universe! I love the topics of your videos! These are the kinds of questions I always ask in my head when I encounter something I don't understand! Subscribed!

[@skivvy3565]

Thank you so much for such informative. Yet entertaining videos. Probably the best I know aside from *Secret Life Of Machines* and *Connections* . Both two of the greatest technology/history series ever made. I hope you know how exactly how wonderful a teacher you are.

[@machibutinenglish1468]

This guy is like Tom Scott but experimental, and I love it

[@kori228]

and less political

[@ivan.zhidkov]

This channel is so underrated

[@PsRohrbaugh]

Do you have any recordings without the freezer background noise? I suspect that there are low-frequency components to the "freezing sound" that are getting lost in the freezer noise during recording, and therefore can't be heard after filtering.

[@joshinils]

oh, the graphic at 11:11 has the motlen and solid sides reversed left-right from the previus with the water. split-seconds-confusion on my part

[@swizzleproxi4810]

Its amazing to capture sights and sounds from the microscopic world...a whole new dimension..explored

[@SuperCripple]

This channel has taught me so much. Thank you.

[@Noobificado]

The thing about the sound being too high pitched to hear actually blew my mind.

[@TheDJOblivion]

Freeing ponds/lakes make this noise, probably why it's so intuitive, and why movies are so accurate.

[@F34RZ3N]

As a Canadian I approve this Video

[@nancyhunt9834]

Smallest but greatest channel!

[@Iodine_53]

this is just awsome! thanks for this great content!

[@QuyetNguyen-hd8ko]

Just astonishing! One mechanism for a lot of phenomena

[@FunOrange]

wait what... for a second a thought this video had 3.7 million views, not 3.7k views!! It's so well made and the title is so enticing

[@AlphaPhoenixChannel]

That’s be nice! Needs like a LOT of people sharing lol

[@AlphaPhoenixChannel]

Glad you liked it!

[@Ieno]

0:20 glad you real-iced that!

[@Webtroter]

@10:41 about dendrite. Research is also done for batteries

[@davidconner-shover51]

about the time this video was made, though I was unaware of this channel at the time I remember a particularly sub zero morning where I went out to start my work truck, I remember starting it to let it warm up for a few minutes, and noting the half a bottle of water I'd left behind the night before it was still liquid!, no trace of ice in it. I could tilt it, watch it move like regular water, a few minutes later, after I got in, and started driving, I went to take a swig of this water. took the top off, and tilted it back tom take a swig. as soon as it touched my tongue, I heard a fairly loud snap, the water froze to slush instantly

[@hadiakbari740]

Again another brilliant piece of work! Congratulations! 👏👏👏👏

[@VyvienneEaux]

My hypothesis before watching the explanation is that the ice, which nucleates and freezes outward from these nuclei, creates a pressure wave from the propagation of its own wavefront, similar to how the wavefront of the fire in certain types of explosions (such as a stoichiometric H2 O2 mixture) creates exceptionally loud blasts. After video: Wow, my hypothesis missed a lot of nuance, and I learned something amazing! I'm trying to explore fractals in turing-type reaction-diffusion mechanisms in developmental biology right now as a hobby, and so I love seeing how ubiquitous fractal-related phenomena are in nature. Here's a question I've had for a really long time now: How do chips bags make such loud sounds even if you manipulate the material extremely slowly? I have a number of surface-level hypothesis but I'd love to see the thoughts your incredible mind has on this. It's just amazing to me how efficiently a chips bag turns mechanical energy into sound.

[@bo-dine7971]

Pretty much most circuits have wet electrolytic capacitors in them, it's a miracle you didn't kill the camera.

[@kevl0d922]

That’s a really detailed game design!

[@JC-11111]

Whoa. 10 yr old kids were actually calling it the right thing. It actually is a double bounce. Sweet! I never thought about that.

[@Veptis]

Resolve pro tip: use the context menu under workspace .. hide page navigation bar. Gives you more workspace. You can still switch to color by hitting shift+6 and deliver by shift+8 and edit by shift+4.... Etc

[@PyricDemon]

That’s the sound I had imagined something crystalizing would be

[@Bubu567]

When I was growing bismuth crystals, I could also hear the crystals forming. I came to the conclusion it's because bismuth expands when it cools. So the crystals were physically pushing, cracking and breaking other crystals as they form.

[@aaronsmicrobes8992]

I find this incredibly fascinating. I'm betting that there's a strong correlation between dendrite size and the pitch of the crackle, so I'm theory you could determine the size of the dendrites when they break. There might also be something interesting to gain from the volume of the noise. Maybe when two similarly sized spikes interact and the smaller one breaks the noise is quieter, but when a small meets a large the noise is louder? If only there was a good way to control the formation of the crystals. Maybe including specially designed nucleation sites that can form regular crystals aligned in a particular direction or something (metallic hexagonal particles in a magnetic field?). Seems tricky to pull off, but it'd be really cool to see and study.

[@zZHotBurritoZz]

It sounds like millions of microscopic spherical magnets sticking together! Amazing!

[@Digalog]

Damn bro you are answering so many of questions I had. And I did look up a lot of things but you come with a lot of new insights. I love it.

[@BRUXXUS]

This is also a decent visual representation of what kills lithium batteries. From what I understand, by charging batteries beyond 80% and under 20% the ions migrate to the anode/cathode, accumulate, and start growing dendrites which puncture the membrane layers of the battery, causing a bunch of tiny short circuits.

[@cosmiclikesminecraft]

So never let your phone go below 20?

[@n111254789]

@@cosmiclikesminecraft it's a good idea to keep it between 20% and 80% there are some phones such as the OnePlus 7 Pro that allows you to prevent charging past 75%. It's handy for preserving battery life.

[@VyvienneEaux]

Regarding the Avatar comments, first I'm so glad you're an ATLA fan! Weirdly, I'm an ATLA "superfan" even though I generally don't like being fanatical about things. ATLA and LOK are anomalies for me because I have a hard time sitting through most shows and movies and want to watch them at 2x speed and skip episodes (and sometimes just read the Wikipedia page instead of finishing a show or movie if I think it's taking too long), yet I've rewatched all of ATLA and LOK 8-10 times each. Second, and more importantly, I imagined our culture got the ideas for the freezing sound effects from watching things rapidly freeze, especially when held in liquid nitrogen.

[@AlphaPhoenixChannel]

Atla and lok are AMAZING

[@cauhxmilloy7670]

One potential follow-up experiment that would be interesting is to add copper/aluminum (or other good thermal conductor) into the water and observe the dendritic growth that happens along it's edge. Would be interesting if the thermal conductivity affects the speed of growth, as your explanation seems to assert (breaking the "heated" water depletion zone).

[@testboga5991]

This video needs more views!

[@MRHEY]

UNDERRATED CHANNEL

[@tmhchacham]

6:55 "In a perfect world, everything would crunch down into spheres, because spheres have the best surface to volume ratio. But, we don't live in such a thermodynamicist's paradise." It's just like balls that turn to ice, In a thermodynamicist's paradise.

[@poke7661]

too many syllable

[@mehmetseyit7210]

we have spent most our lives living in the thermodynamicist's paradise.

[@kindlin]

@@mehmetseyit7210 Don't succumb to vice and cowardice in the thermodynamicist's paradise.

[@DehimVerveen]

Awesome! The freezing sound mostly reminded me of the Freeze Rally race in Jak X Combat Racing.

[@kristineapodaca3173]

I fell forty feet in a rock climbing accident. When I hit the ground, the noise I heard was EXACTLY the sound that Wile E. Coyote makes when he flies off a cliff. I guess maybe the Warner Brothers sound guys work with the guys who applied the freezing noise to Batman and the Avatar movies! No idea how they figured it out, though.

[@fn9869]

weirdly i did hear a little bit of the cracking on clip 4 before the pitch shift. strange

[@seeigecannon]

You might want to hit up Destin of Smarter Everyday. He has done high speed microscopy with jellyfish stinger things in the past. I work at a place that does a lot of crystallization. We have to seed our material otherwise everything can crash out all at once which yields a terrible product quality, or it just sits supersaturated and forms nothing at all. I have a small reactor I run experiments in, so I am sometimes lazy depending on what I am working on and skip the seeding step (typically 20C). I can sometimes take it to -5C before giving up and doing things the right way.

[@unvergebeneid]

And? Did you ever hear your crystallizations?

[@AntonioAstorino]

Glad you "realiced" it!

[@andiralosh2173]

Been spending most our lives livin in a thermodynamisit's paradise 🎶

[@NicksWhipShop]

Just found your channel. Great stuff! Based off of what's hanging on the wall behind you, it looks like you've been having some fun with thermite. Gonna look for that video next!

[@atlachanacha]

In Finnish, there's term "paukkupakkanen" ("banging frost"). It's phenomenon that happens near -30ºC/-22ºF temperatures, where tension from heat expansion of houses/structures/trees are released with a loud "bang" sound

[@njhcomposer]

Hey man, I recently discovered your channel and I really love the style and the editing of your videos! Super informative and fun topics as I’ve been going through some of your older videos. This one is one of my favorites, it blows my mind that there is a sound for ice like this. Keep up your awesome content, I will watch every one you make. I have a random question though - what song do you use in your intro to the videos? It vibes so hard and I can’t figure it out 🤔

[@bytesandbikes]

Interesting, the relationship between freezing sounds and fracturing sounds

[@fixation1234]

I watched too many of your video's before noticing i wasnt subscribed. Leaving this comment here to help reverse what I did to the youtube algorithm.

[@wayne-ingraham]

This was fascinating. Thanks for sharing. I definitely learned something cool today thanks to your video.

[@marcosmoraes1980]

Absolutely fantastic video!!!!

[@justsomeguy5628]

When I need to make an ice cube small enough to fit in the neck of a bottle, I run it under some water(temp doesn't really matter), and the instant you first played the noise I could very clearly tell that that's the same sound. But I also am very familiar with the sound because I can hear it from ice forming on windows when I'm in my car or house in the winter, and also because you can hear it right after peeling of a sheet of ice from a window, as the water trapped underneath will form many new ive crystals within a few tenths of a second.

[@Cketzalcoatl]

Dude, you're the most under-rated science youtuber right now. This is amazing stuff! I'm a materials engineer as well! Do you reckon a University nearby could have an environmental SEM (ESEM) that you could use? That should have the temperature and vacuum controls you need, and obviously super high mags.

[@AlphaPhoenixChannel]

Ooh good thought - I use an SEM all the time that I believe can run in a low vac mode, although I’m not sure what that does to the signal (and therefore maximum framerate). I’d need to do some convincing regarding putting liquid water in a research level vac chamber though

[@MakeScienceLM]

Wow!! Excellent video!!!

[@roelant8069]

13:10 interestingly, I think I hear the dendritic growth in this clip It's definitely not as loud as in clip 3, I can barely hear it over the background noise. I'm not sure if my brain is playing tricks on me or whether it's just within my range of hearing.

[@nisargbhavsar25]

Same here. I actually heard a faint crackle above the noise.

[@Einhamer]

Dont worry, you're not alone, I heard it too!!

[@jrnvnjk]

I'm probably wrong but, if it is the dendrites breaking, you might be able to record some breaking ice, change the pitch of that and compare it to the sound of the dendrite growth. The change in pitch would be because of the tuning fork example you mentioned

[@chakra6666]

incredible! I love your work, so don't get disheartened by not getting tons of views (if you are disheartened by that at all) :)

[@joshinils]

wait what? i landed on an unlisted playlist upon clicking the notification for this upload?

[@AlphaPhoenixChannel]

That's weird - is it working now?

[@joshinils]

@@AlphaPhoenixChannel well, its working, yes. i just happen to be viewing this as part of a playlist

[@joshinils]

@@AlphaPhoenixChannel kzbin.info/www/bejne/jZXClGN3bdpmotk thats where i land when clicking on the notification

[@joshinils]

@@AlphaPhoenixChannel maybe cause these have been uploaded in quick succession?

[@dereknalley]

Using your tuning fork pitch concept, you may be able to calculate the size range of the dendrites breaking in each case and know what level of zoom to look for should you ever get a microscope and video setup for your experiment.

[@perez8pepe]

Great video, love your explanation. Thanks Brian.

[@AyyyGabagool]

God I love this channel.

[@D1GItAL_CVTS]

Wow, I expected it to sound not like what I expected it to sound like, but it souded exactly like I expected, which was unexpected!

[@Scrogan]

I was wondering if it would be possible to make the crystals more visible against the water. While a dye probably wouldn’t work too well (and ,ya interfere with crystal growth), how about putting a polarised light source beneath it and putting it through another polarised filter before the camera? Not sure what it would look like, but it’s probably easy enough to be worth a shot.

[@aniksamiurrahman6365]

The sound is really metallic, like dropping a small coin or a very small chain on a steel surface.

[@unvergebeneid]

How do you hear the sound if it's in a vacuum chamber BTW? Is it completely transmitted through the water and the container? If so, if you have a contact microphone, you might pick it up much better still!

[@Nanukimo]

It's a partial vaccum at the most it's only pump down to 10-20 microns. Anything anymore you need to start having some expensive pumps like diffusions pumps I ran high vacuum sintering furnaces and at 20 microns is enough of an atmosphere it would ruin the metal we ran.

[@cheaterman49]

You know, this got me thinking. People often say there's no microphones on slow-mo cameras, which is fair enough ; but surely there's audio acquisition systems with extremely high sampling rates for scientific purposes right? And I say "audio", but I guess I'm talking about ultra fast/high resolution pressure measurements... Then again, the more I think of it, the less certain I am that it would be useful... (synchronizing time could be a major pain, also there's zero guarantee the crystal you're focusing on *right now* will be noisier than the others, etc...)