The Inverse Leidenfrost Effect
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- čas přidán 24. 01. 2019
- Droplets levitate on a bath of liquid nitrogen and are spontaneously self-propelled. Thanks Audible! Start a 30-day trial and your first audiobook is free. Go to audible.com/VERITASIUM or text VERITASIUM to 500500.
Special thanks to Dr. Anaïs Gauthier
Physics of Fluids: pof.tnw.utwente.nl/
Self-propulsion of inverse Leidenfrost drops on a cryogenic bath
Anaïs Gauthier, Christian Diddens, Rémi Proville, Detlef Lohse, and Devaraj van der Meer
PNAS January 22, 2019 116 (4) 1174-1179; published ahead of print January 22, 2019
www.pnas.org/content/116/4/1174
For a detailed description of the setup:
www.lps.ens.fr/~adda/papiers/L...
And self-propulsion is also seen: www.lps.ens.fr/~adda/papiers/I...
Other recent (hot) Leidenfrost experiments that might be interesting:
* Leidenfrost wheels: • Leidenfrost Wheels
* Leidenfrost maze: • Video
* Leidenfrost explosions: • Leidenfrost explosions
Special thanks to Patreon supporters:
Donal Botkin, James M Nicholson, Michael Krugman, Nathan Hansen, Ron Neal, Stan Presolski, Terrance Shepherd
Thanks to Prof. Kevin McKeegan at UCLA for the liquid nitrogen
Filming by Raquel Nuno
Additional animations by Alan Chamberlain
Inverse Leidenfrost: stove floating on a droplet
Brilliant
To be fair, that's pretty much what it is.
😂😂😂😂
@@sycamorph No it isn't?
@@fuzzy4461 Why not? Droplet acts as a stove and heats liquid nitrogen, and floats on the gas produced.
Tried to recreate this at home. Cat is levitating on the nitrogen but the water droplet is nowhere to be found
I was expecting the "instructions unclear" meme. Close enough.
Eyyyy its Anton. Nice to see that you guys all watch each others videos
What's that, meow?
hello wonderful Anton, this is person.
I discovered a similar phenomenon which I call the Lazyfrost effect:
During winter, my two cats don't go outside too much, but instead are levitating themselves on my bed and simulate hibernation as good as they can.
Thanks for highlighting our work from Anaïs Gauthier!
Anaïs is really pretty!
would that bouncing droplet pilot wave analog work with this set up?
czcams.com/video/WIyTZDHuarQ/video.html
Vctor ohmygawd stfu
@@jluchette no u
Really cool.
If you used oxygen for the centre beaker you'd eliminate the issue of the liquid boiling because it's got a higher boiling point than N2.
we can all agree that water droplet was riding V A P O R W A V E S
The scientist is so hot n cute!
Did someone said... V A P O R W A V E ?
That Leidenfrost A E S T H E T I C.
【ＲＡＲＥ】
V A P O R W A V E is dead.
You should really be GOGGLED UP for this bro 🤓
Smartass
OH NO!!! I just saw something very VERY hideous! I looked in the mirror! OH NO!! But I am the best CZcamsr of this generation so it is all good! OH YESSS!!! Thanks for you attention dear SMART
I think I remember hearing somewhere that small splashes of liquid nitrogen won't harm you.
You look cool if you get liquid nitrogen in your eyes.
@@Mutantcy1992 I appreciate the joke, however, it also sounds quite painful
I was just watching Backyard Scientist drop lava into his pool, and noted that the lava initially floated on the water for a while before it sank. My first thought was "reverse (inverse) Leidenfrost", the steam from the boiling water is keeping the molten rock afloat. And here you are now doing a video ON THAT EXACT THING!
What's the name of that video?
@@s888r it’s called “Pouring lava on my pool!”
Thank you for your comment!
"you've probably heard of the leidenfrost effect" yeah sure i have! *nervous laughter*
yo Idot
^ ironic post
Yeah right, my thoughts actually were like "yay, next time someone accidentally drips some water on the stove top, I can sound like I´m REALLY smart" :D
Don’t tell me you’ve never heard of it
I giggled so hard at this.
Me: Google, define "Indefinitely".
Google: Literally, tens of minutes.
"unspecified period of time" or "unlimited". He probably was referring to the former.
IcyCloud
But that doesn’t make sense either as he specifies how long right after. Not precisely, but I’d still consider it specified
@@lucaslucas191202 It's been observed for that long and then classified as indefinitely. There's no mention that it stopped after that tens of minutes, just that they stopped observing it
@@SuperHagrids
So indefinitely as in unlimited right?
@@lucaslucas191202 No, indefinitely as in "We don't know really because we haven't seen it stop and we don't know if it will eventually"
Is the cat required for this demo?
Would like to replicate this but I'm not sure If i need a cat
Cat is essential...
You could try but it won’t end well
You need a cat.
Full stop.
There's a 50% chance that you do.
I mean in most experiments you want to keep as many variables the same as possible. The lack of cat may have been why his first attempt went awry.
"This episode was supported by viewers like you"
The nostalgia of growing up on PBS shows.
They recently discovered the triple Leidenfrost effect, where water and ethanol droplets on a hot pan also bounce off of each other.
I loved the format of this video. It was great to actually bring in the scientist who did the experiment.
So that droplet is literally moving because of vaperwave
#vapenation then?...
h e a d y
@@cristianverdugogalaz8725 pilot wave theory
No-no-no, vapOrware
There is your PhD topic: Moving fluids with Vaporwave
The title alone caused my finger to click that shiz. Always love these videos. Thanks again for your efforts. NOW to only find a use for the effect :)
@hyper always an option... It's a better word than poop. :)
That's how titles work! 😃
You are really one of the very best youtubers, so interesting mix between science, photography and fun!
I like this thing you're doing where you call up experts. It adds that extra layer of authenticity to the video.
Really loving all these video calls with experts on scientific issues and phenomena. Hope there are more! ^^
So you are saying we can make a really expensive mechanical game of pong?
I think they already did that on Adam Savage's Tested youtube channel -- analog pong
Genius Idea
I'd buy that for a dollar!
Pong was analog. No digital circuitry.
@@soylentgreenb And I quote "created using his knowledge of digital circuits".
It has a scoreboard, there is going to have to be some digital counting unless you think they are storing scores with a sample and hold circuit.
3:33 I love that badass triple-droplet circling round
Very well done, when I see your channel and I see the number of views , I understand , that world is so far behind, you have done a tremendous job. We collectively should promote such channels. Very well done.Thank you.
Great Video!
Loved the image comparing h and h + dh, helped my understanding a lot!
I've got a really good animator who put these together in the middle of the night. I think that's essential for understanding how this works.
@@veritasium The animations in your videos are always top notch and have helped my through parts I didn't even understand throughout my degree (I'm looking at you semiconductors and magnetism!).
Thanks again to you and the animator.
Veristablium is back!
Ha, I thought you said he was black.
Duke from the Vatican
Love watching Dirk's videos!
Tim?
@@Adeloye1000 you need to ask?
I feel very comforted when I watch your videos.
Im glad you are making more videos now!
6:51 Hey Vsauce Michael here!
Hey VeSauce
where are your fingers?
@@googletalkfish5491 I know you can see them by just raising your hand, but HOW DO YOU KNOW THEY'RE REAL?
@@TheStressIsReal You might say, well, I know where my fingers are. I'm looking right at them. Or, I can touch them, I can feel them, they're right here and that's good.
@@googletalkfish5491 lol. Long live Michael
Awesome video as always!
Great and interesting video, thanks for that.
and also dr. gauthier seems to be a nice person and to love her studies, great to see
Bro you are just the coolest of the cool! Thank you over and over for sharing great content
Very interesting video. Also, thank you for pronouncing Leidenfrost correctly!
Me watching this one day before my Maths paper and thinking
Hell ya , this looks amazing
I really like the crude presentation of your videos.
Really dig the application part! Was trying to figure it out myself so that was a total mind blown!
moving around embryos on top of liquid nitrogen is not an application, it sucks quite frankly, YOU WANNA STORE and you'll never bother making canals of super stable and continuously replenished liquid nitrogen.
Came for the science, stayed for the cat.
Came for science but strating with ad
3:05 "It has been observed to last for tens of (in my head: "thousands of years") minutes."
Super awesome video Derek.
Very proud of Dr. Anaïs my amazing cousin
At least, with your "missed" attempt, you visualise what happens when two droplets merge (2:35), and it may help people to imagine neutron stars merging and the conservation of angular momentum.
What I found interesting is that the drops form indents in the surface below so they coalesce into larger drops instead of staying independent like when the drops themselves are evaporating.
Your quality is increasing, very nice.
I have only basic knowlage of physics so thank you for the visualization. It really helped me to understand a bit more
The perfect application for this 3:42? Isn't it obvious?!
The DVD screensaver... will it hit the corner :P
As a french i find her English so good that i'm not so sure she's french too...
OH cool video by the way!
thank you veritaseum, very cool
Thank you for making awesome content!
I like the SciShow shirt that future you is wearing! :)
Veritasium is finally back.
Now say goodbye again lol
Incredible experiment!!
love your channel man
I Read the title, I liked the video.
You should always wait to watch the video. Critical thinking is good.
I read your comment, I liked the video.
Can you hear "that is cool" at 2:39?
bluesn0w no pun intended 😜
I heard it 😂
Dude! I heard about this effect in a sci-fi book (The Forever War by Joe Haldeman), but never knew the name for it. I like the application she mentioned. I won't see any value from it directly, but I can imagine applications of it to improve a lot of things. Thanks for sharing the knowledge!
Dr. Anais Gauthier is very nice. Very very nice
oh ... when I heard about the inverse Leidenfrost ... i was expecting floating a bubble below the surface of a fluid ...
welp, I guess that would be the NEGATIVE Leidenfrost effect
Sounds like something that reached a negative Kelvin reading
I'm sorry, I literally forgot what the video was about the instant I saw the physicist.
Also, that potential application they explained was one of the coolest things I've ever heard.
It's like, Minecraft Farm mechanics in real life, except even better.
I freaking love this channel!!!
she is so cuuuuuute!!!!!!!!!!!!!
Wow. The Dr. is super cute! :) Very intelligent too, without debate.
Nice video too :3
No comments saying "how cute she's" or anything.
Society it's changing at least on this channel subscribers.
She's cute
I want to help her make an embryo
And what's wrong with sharing my positive opinion about someone's looks? I mean it's literally the first thing you see in a person and it's not something you should consider a taboo.
Maybe she's not that cute?
But aren’t you still politically incorrect if you HAD thoughts about her being cute? So what if you never spoke it out loud you’d still be carrying that thought with you and the bias that comes along with it.
Very interesting and fun to watch thanks
We’ve missed you!
Speaking of potential applications, I can see it used in an RNG to generate numbers by looking at the angle in which the drop goes in reference to a fixed line and add drop wise for each request of numbers.
That expert is very cute. I now like science even more.
I want that floating drop as a screen saver.
A nice modern twist to a 90's PC thing.
Great video, I always did this in my secondary classes and never fully understood what was happening.
I think discord is gettting better on videocalls ;)
4:40 Is this similar to the Magnus effect?
That introduction between him and Dr. Gunther was cute. Clearly both were like "uh... hi, you're unexpectedly cute, um, right... science"
very cool!...and warm...
I love this channel
2:20 looks like Derrick is going insane trying to figure this out lol
The scientist was so damn cute
IS he a scientist or just a guy who makes cool science videos? :)
I didnt really understand the application but i love the phenomenon!
After spamming it every channel i like.
Congratulations Amazon. You got me perma sign the freaking audible.com and it is great.
The lighting looks great on the main camera! You might want to use some colour grading on your secondary camera, the difference is pretty noticeable, which (at least to me) made it look worse in quality.
Someone NEEDS to make a Pong-ish game with those drops moving in straight lines xD
I love the most recent Veritasium videos where you talk to Scientists about their work
The moon lander shirt is awesome!
I am currently 3D printing a Saturn V at 1:82 scale but I am missing a nice lander model.
5:31 pentagram ⛧
Devil worshippers confirmed! 👿
That satanic droplet will open the doors of hell, and all our ice cream will melt!
Wait your joking right?
Or golden ratio...
@@Selur91
Oh no! 😱 Not the ice-cream! 🍦
This also heralds the return of the Dark Lord, Chin Chin!
Heptagram
You should do a colab with the slomo guys on this!!
yes absolutely
Awesome video!
The motion of the droplet on the surface looks a lot like the motion you get with magnetic levitation over a large surface (relatively speaking). Same behavior where no matter how hard you try to deposit the levitating object, it takes on a "random" trajectory and begins to travel across the surface bouncing off the edges of any container it's done inside of. The thing I remember about that demonstration was that any force imparted upon the levitating object will cause it to move again once stopped.
5:38 she went straight sexy highly intelligent gangsta nerd mode! I think I’m in love
Eventhough I am too stupid to understand this, it was very interesting.
😂
thanks for the tip,
now lemme check that book on audiobookbay 🏴☠️
Thanks for bringing the editing back to utubye auqlity.
*_aaaah that's cool_*
oh yeah yeah :D
ANAÏS ......
😍😍😍
that pentagram was amazing
Dude, this is soooo cool
5:31 IT'S A SIGN!!!!!
Is it inverse though? I don't think the definition of Leidenfrost effect explicitly states which part should be producing the vapour. It's only us giving the example of a water droplet on a stove that has us thinking that there has to be a droplet at all. To quote Wikipedia (yeah, I know it's not the best source but still) "The Leidenfrost effect is a physical phenomenon in which a liquid, in near contact with a mass significantly hotter than the liquid's boiling point, produces an insulating vapor layer keeping that liquid from boiling rapidly." For example when a hot steel ball is dropped into water, it is Leidenfrost effect that keeps it from rapidly cooling and boiling the water.
the ball of metal would be almost cooling the instant it touches the wather , it is still the same effect
@@Fenrisboulder I still understand that there is a clear change in the rate of cooling when the vapor layer dissipates, right?
@@niklaskoskinen123 ye it would cool faster without the vapor layer cuz then the two energy reservoirs will have nothing in between and R will naturally equal zero media.discordapp.net/attachments/424963171225436161/538472221040050207/Capture.PNG?width=400&height=73
Inverse as in; It's not the drop that is producing the vapor nor is the surface providing the heat. So Leidenfrost yes because the effect is the same but the other requirements are flipped. The steel ball in water is just a variation on scale where the hot surface is made into the ball but still the water is providing the vapor.
To make it even clearer. The water droplet does eventually disappear. The hot ball does cool and the effect stops. So either the heat runs out or the water. In this setup de droplet is basically just for the ride and does not change.
I may be wrong(probably am) but that is my understanding of it.
@@HenkJanBakker I get your point, that the mass ratios are recersed, but still, the definition doesn't require water nor does it require a droplet. It only requires a liquid (in this case the liquid nitrogen) and a mass hotter than the liquids boiling point (in this case the silicon oil). In no way, at least to my mind, does the example in the video differ from the definition.
i love dr gauthier!
Amazing!!
Sliding into her DMs...."Hiiiii, how are you?"
6:50, VSau....... Oh, wrong channel, my bad.
OH cool, so you guy's essentially created the analog version of my dvd logo bouncing around my tv screen lol. Just kidding, awesome science man. I've always loved your channel and videos, keep up the good work. This was a fun video to watch! :)
let's go dutchiesss! Proud of my country to even make in on this channel
I’m a simple man: I see Veritasium notification, I click oh yeah, oh yeah
Isn't it tiring to be a beta?
Tenpenny you tell me
@@cheezuschrist1102 Atleast no one told me to use this profile. And how many _Tenpennies_ do you spot in comment sections? Exactly!
Tenpenny huh? What are you saying?
That cat was cute.
Ikr
This seems extremly useful for exploring Titan
I once pushed a styrofoam cup of coffee across a table and it vibrated such that the standing wave on the surface formed beads of liquid which rolled around on the surface of the coffee which was of course mind blowing. I have since repeated it a few times to demonstrate to people who don't believe me but I have never understood how exactly it works.