Can a Boat Float In Supercritical Fluid? (Stabilized Version) 

Your wildest dreams, huh? 🤷🏻‍♂️

@@dangerous8333Yeah, those are some pretty lame wildest dreams, especially when there are tons of videos of it on RU-vid.

what type of dye do you recommend? hmmm... bromine? fluorine? not many coloured gases...

caffeine, maybe

​@@charlievane I really hope you meant coffee.

I wonder if it would fall out of "solution" or it it would stay in the "less dense solution/high density gas" that fills the tank.

@@elduderino1329 nope, I meant the pure caffeine molecule - coffee is a mixture of impurities.

"I choose.. or" "I'm feeling all of the above today"

“Guess”

One should never be super critical about such things 🤷🏽‍♂️

me too!

That range is between 400 g·¹ to 800 gl·¹

The problem is finding a material that would have that low of density at that pressure. even the Styrofoam lost some of it's buoyancy due to being crushed. and Silicone arogel would fill up with liquid Co2 since that is how it's made. maybe coating the arogel would work, but it's going to shrink some.

@@LaserFur 'but it's going to shrink some.' Yep, something that would float on the combined phase and move up was the first thought. But most anything should crush or saturate, and then sink instead. But forget a solid object, find a different density liquid or gas that would have the correct properties. Should be able to find something that would work, and be a blob between them and then move up when it goes supercritical.

​@@Sameer_S_Kulkarni No, it would be less than 400 g/l

@@akulkis Yes, it would be less than 400 g/l

Yeah, even with small motions of the eye staying focused on the "boat", the eye still has the motions to do

I do not understand why there was a need to shake the whole apparatus in the first place. If everything else stood still, the minute changes in the meniscus will automatically draw our eyes towards it. This is better versus shaking it where everything is in motion and we can't even focus on the important thing (ie the meniscus).

​Exactly. The shaking was annoying af.

Congrats, you understood the joke

Most dyes that we use are used in water or alcohol so making those supercritical are a lot harder to achieve. I'm personally unsure how the pigments would react on their own. Maybe they would stain the vessel due to the pressures implemented.

Its not about wow factor, its about a proper scientific demonstration.

​@@SissypheanCatboy shaking it doesn't contribute anything to the science

Very polite, I was about to just scream ffs quit shaking it :p

It annoys me as well

To show miniscus

Everything that floats is using what you're calling displacement. Styrofoam is mostly air, which is why it's good at floating no matter what kind of shape you make out of it. Boats are like if you took a huge block of styrofoam but all the foam was compressed into a "boat shape" and all the microscopic air pockets were consolidated to be the place where you'd sit in a boat. Styrofoam was arguably the better choice here as action lab could shake it as much he wanted and not risk tipping the "boat" over, ruining the experiment. I imagine normal boat would've behaved exactly the same as the styrofoam piece except maybe up until the supercritical fluid was cooled back down to a normal fluid, as it could have filled the boat with a lot of liquid and sunk it.

also, you probably diffused the air out of the styrofoam and it is full of co2 at that point, i suspect it would do the same thing if you put it in water with high pressure for a while until all of the air contained was crushed, if you were to fully diffuse co2 into the styrofoam by soaking it beforehand for a while at higher pressure you might be able to keep the pressure in the "boat" higher than the surrounding supercritical fluid...but... that is just a guess and i am basing it on my own knowledge and no actual research

Yes speciallly the tip at the end

Me too