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What property of water allows it to cool the surface of your skin on a hot day?
Wiki User
∙ 14y ago
The EVAPORATION of the water cools your skin. When the humidity is high, the water on your skin doesn't evaporate as quickly (or at all) leaving you with that 'sticky' feeling.
Think of the "coolness" as energy being taken from the surface of your body. Heat is energy. The heat/energy is leaving your body in order to turn liquid water into vapor, a process which takes energy to happen. When humidity is higher, there is more water vapor already in the air, and it is harder for liquid water to become vapor. That is why humid days feel hotter, because less water can evaporate from the surface of your skin to give you that cooling effect. This is the difference when people say "yes, but it's a dry heat." Hot and humid will feel hotter than hot and dry because evaporation can cool you in a dry heat.
Wiki User
∙ 14y ago
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