Yes they do cool as they evaporate.
When you heat up a liquid, it evaporates and turns into a gas. But it takes energy to pull a molecule out of the liquid and turn it into a gas, since the liquid molecules stick together and it’s kind of hard to pull them apart. That leaves a little less energy for keeping all the molecules jiggling around. In other words, they actually do cool down a little bit just as they evaporate. So, left to itself, the liquid would cool down as it evaporates.
Yes, liquids cool as they evaporate. In order to evaporate liquids draw heat from the environment around. The liquid that is left behind as some of it evaporates is cooler than it was before that amount evaporated. You
2006-11-05 14:53:41
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answer #1
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answered by Debra K 2
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Liquids heat up as they evaporate. Heat is actually a measure of energy transfer, and liquids require a certain amount of energy ("specific heat capacity") to evaporate.
Evaporation occurs when there is enough energy for a liquid and overcome the intermolecular forces (like cohesion) that keep individual molecules together. This is also known as the liquid's boiling point - although there are instances when liquids evaporate without boiling.
It may seem that liquids cool as they evaporate because they make the surface they are in contact with cooler. Heat travels from hotter areas to colder ones, so a liquid placed on the skin (sweat or rubbing alcohol, for example) will "transfer" heat to reach the energy level needed to evaporate. This leaves the skin feeling colder, but the liquid itself has absorbed more heat.
Animals use this to their benefit: dogs pant so saliva on their tongue evaporates and cools them down; this is the same reason why people sweat.
Hope that helps!
2006-11-05 15:08:48
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answer #2
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answered by jennifer n 1
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I Do Not belive they Do Because For Liquids TO Evaporate It Needs To Be Hot So No It Does Not Cool
2006-11-05 14:43:13
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answer #3
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answered by Advice 1
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no, but its an endothermic process. it's why sweat cools you
2006-11-06 05:10:27
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answer #4
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answered by shiara_blade 6
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fart
2015-12-14 13:18:15
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answer #5
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answered by ? 1
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