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Postby elvinjansol on May 21st, 2016, 10:43 am 

Its quite amusing that evaporation has cooling effect. What could have cause this sensation?

Re: Evaporation

Postby Dave_C on May 22nd, 2016, 7:05 pm 

Hi elvinjansol,
When water or other liquid evaporates, it changes phase into a gas. The change in phase requires energy be added to the molecules of the liquid so they have enough energy to break free and become a gas. This heat is sometimes called the heat of vaporization or also called latent heat.

The energy required to convert liquid to gas has to come from the molecule's immediate surroundings, so as heat is transferred into the evaporating molecule, heat has to come out of the surroundings which reduces the temperature of the surroundings and creates the cooling effect.

Some additional reading if you're interested:
http://hyperphysics.phy-astr.gsu.edu/hb ... sweat.html
http://www.evaptainers.com/updates/2014 ... ve-cooling
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