Can a Boat Float In Supercritical Fluid?

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In this video I turn CO2 into a supercritical fluid with a boat floating on it to see what happens when the fluid passes its critical point!

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Sorry for shaking it so much! I thought one of the most interesting things is watching how the liquid waves change. And also when the meniscus is almost gone, you can’t really see anything unless it’s moving. But point taken if I ever do this again, I will do less shakes, lol.

TheActionLab

"scientist shakes a bomb for 9 minutes"

kunalgautam

"I'm kinda nervous about using this much pressure" proceeds to shake the apparatus over and over. :D

Qermaq

Buddy I think I've got bigger problems if I'm on a lake thats going supercritical

brendanmassaro

Good to know I'm not the only one who couldn't handle the shaking.

Efreeti

Everyone is supercritical about the shaking.

brendanward

I only thing I thought during this entire video was: "STOP SHAKING THE DAMN THING!".

MongooseReflexes

My boss: "This report is super critical."
Me: "Ah! So much pressure!"

Sheepsbane

A missing observation here is that the styrofoam got absolutely crushed. While it's in there you can tell the surface that was mostly smooth at the beginning is dimpled inward significantly. But then at the end 7:51 when he's handling it, you can see that the former half sphere is now a bowl. Styrofoam is normally less than 100 g/L density, so for it to sink in a 400 g/L fluid means that it must be squished to less than a quarter of its original volume.

davidbuckley

I just had a job interview for a company that uses supercritical CO2 as a solvent in industrial processes, I wish I had seen this video before my interview, very cool to actually *see* the phase transitions! Note that both liquid and supercritical CO2 are compressible, so those density figures are pressure and temperature dependent.

jpe

The sound of that shaking table was painful.

ztornow

That's the coolest demonstration of a supercritical fluid I've seen. Kudos

drfroglegs

Super cool idea, but I need to criticise some things:
- you covered the thing with your hand at the beginning when releasing the pressure;
- stop shaking it please;
- the word you're looking for is "interface"; the meniscus is the bending or "climbing" of the liquid along the walls of the container.

bthrkay

the shaking wouldnt be as bad if you either stabilized the footage to the tank, or mounted the camera directly on it, so we just see the liquid moving, and not the whole tank. BUT i didnt mind it that much and it was a very interesting demonstration!

PurpleKangaroo