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latest user's comments

#81 - Yes because the teacher is responsible for the mess and distur…  [+] (1 reply) 09/20/2015 on The bell doesn't dismiss... 0
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#83 - daniboyi (09/20/2015) [-]
Maybe, but student's aren't exactly happy and will certainly not respect the teacher more, if they get their only free time between classes taken from then and possibly even gets to be late for another class, which they may be punished for.
#121 - So correct me if i'm wrong but i didn't quite get the explanat…  [+] (2 replies) 09/19/2015 on Tennis Ball Submerged in... 0
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#122 - Einsty (09/19/2015) [-]
It vaporizes so fast it makes its own gas cushion. By definition, it has to take exactly the same ammount of energy to change states, but the gas lining makes a layer that insulates the mass, thus slowing the overal heat transfer.

But take it with a grain of salt, I'm really sleepy.
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#123 - problematique (09/19/2015) [-]
Yea lol when I said less energy I meant less energy overall, tho the cp of a substance is a function of its temperature. But still, does it take so much less energy overall that it's enough to not fucking freeze your hand to mutilation? I understand the concept but the math doesn't seem to add up. It seems a bit crazy how a layer of gas can support so much liquid that's trapped inside, and be used as an insulator on top of it.

I guess the temperature difference is SO huge that the outer layer undergoes some kind of shock and accumulates the energy that's being transfered to the substance by your hand?

#118 - it's what thesmarterest said, your explanation isn't sufficien…  [+] (2 replies) 09/19/2015 on Tennis Ball Submerged in... 0
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#137 - toviewsauce (09/22/2015) [-]
Eh, Like I said; not really sure. I know this is like 2 days later but... just curious - why do you say that the ball would shrink in my case?
When nitrogen, or any gas for that matter, heats up it it expands: increasing pressure (given a constant volume, like in a ball). Nitrogen then shoots out of the ball decreasing pressure so that the internal pressure and external pressure are equalized. This process would continue as long as the nitrogen inside the ping pong ball continues heating up. Only in the case where the internal pressure is much lower than the external pressure would the ball be compressed - so I dont really understand what you mean by the ball would shrink.
The part about what essentially is the leidenfrost effect is simply to imply that there is little resistance to the spinning of the ball.
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#138 - problematique (09/26/2015) [-]
Oh I'm sorry, the way you typed your comment made it look like you assumed there were no holes at the ball at all.
The ball is empty of material inside, so it contains atmospheric air, if you don't puncture any holes in it, when you put it in the liquid container the following shall happen. The driven "force" that causes heat to flow is temperature difference. So when your atmospheric air is around 25 celsius and you put that thing inside the liquid nitrogen, (i think the nitrogen's pressure ought to be 1 atm because the surface has contact with the atmosphere and while a substance changes states it keeps its pressure and temperature values stable) the air will contract, and will occupy less volume, so the ball will shrink just as a juice box shrinks when you suck the air out of it. That would happen inside the box of course, when it's time to pull the ball out I guess what would happen is, the air trapped inside the ball (keyword air, not liquid nitrogen, no holes remember) would just expand violently, so my guess is the ball would explode if the material is of cheap constracture?

However, if you typed your comment having in mind that the ball had holes on it a priori, then assuming that the holes were completely vertical AND symmetrical (which is impossible) then the ball theoretically should stay fixed, once you take it out and put it on the table.

I'm sorry for the long explanation, I hope I covered your inquiry. I've taken a thermodynamics class the previous semester but since it was thermodynamics I (1), we covered the basics of it, so it might be possible that I'm missing something due to lack of knowledge. I'd be happy to be corrected.
#38 - source?  [+] (1 reply) 08/31/2015 on Shinji Get Me That Fucking... 0
#40 - asotil (08/31/2015) [-]
Jacobs Extraordinary Quest
#116 - post photos of your body and your nutrition habits so we can j…  [+] (1 reply) 08/31/2015 on You gonna die fam 0
#126 - bahtzee (08/31/2015) [-]
It doesn't matter whether you "approve" my life style or not. What does matter is if my life style is scientifically proven to be health or not and whether I acknowledge how unhealthy I am.

I'm a goddamn stick...

but I also don't get as much exercise as I should.

and I know that I'm unhealthy.
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