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/sci/ - Science & Math

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14524240 No.14524240 [Reply] [Original]

I soaked up very hot water from a cup with a rag and noticed that as the water spread throughout the cloth, it cooled much more rapidly than normal.
Makes sense, the same quantity of heat spread over a larger area would mean a lower average temp.
My question is whether or not there is a limit to this? If I had a liquid with a very low viscosity and a very absorbant material for it to spread through, could you cool it to significantly below ambiant temperature?

>> No.14524249

>>14524240
>I soaked up very hot water from a cup with a rag and noticed that as the water spread throughout the cloth, it cooled much more rapidly than normal.
>Makes sense, the same quantity of heat spread over a larger area would mean a lower average temp.
this shows why the "naked ape dissipates heat faster" thing is retarded. giving the hot liquid more surface area means faster heat dissipation

>> No.14524321
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14524321

>>14524249

>> No.14524360

Did you measure the temperature of the cloth before and after?

Most likely heat was transferred to the cloth, and that's where most of your cooling came from.

>> No.14525360

>>14524360
No, just going off of hand feels.

>> No.14525631

>>14524249
i suppose you wear fur coats during the summer?

>> No.14526472

>>14524240
So no one knows? Or am I'm just being dumb?

>> No.14526775

>>14524240
as temperatures start to near each other the process slows considerably. also if the liquid is not volatile at the ambient temp it will slow down

alcohol is better for cooling/evaporation than water for this reason

>> No.14527043
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14527043

>>14524240
I happen to be an idiot with an opinion:

It won't cool below ambient temperature by spreading out, the surface area will just increase the speed of heat transfer between the water rag and the ambient air. Evaporation could cool the water in the rag though if the ambient air is.dry enough and it evaporates fast enough.

>> No.14527463
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14527463

>>14524240
cooling something below ambient temperature requires putting work in somewhere

>> No.14527515

>>14525360
Hand feel doesn't measure temperature, it measures the exchange of energy as a proxy.

>> No.14527594

>>14524240
You can't really cool something below ambient temperature by direct heat transfer with the air.

>> No.14527686

>>14527594
You blow air onto acetone and it feels cold. In fact you don't need to blow on it just let it evaporate on it's own.

>> No.14527957

>>14524249
air insulates my stunted in evolution cousin friend