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The title says it all. If I'm standing in the wind and I'm wet, I feel much colder than when I'm dry. This is true no matter how warm or cold the water. Why is this?

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Evaporation of sweat from the skin surface has a cooling effect due to the latent heat of evaporation of water (from wikipedia). Basically, the heat is transfered from your skin to the water, the water then evaporates, taking with it a bit of the energy stored in it.

Further references here

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  • $\begingroup$ Latent heat of evaporation refers to the energy cost of a phase transition? $\endgroup$ Jun 15 '15 at 2:15
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Our body is trying to cool down so when a strong wind blew, the coldness of the wind transferred to the heat in our body.Thus, our body will feel colder.

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    $\begingroup$ -1 for perpetuating the heat/coldness misconception. Heat is the energy that is being transfered from our body towards the environoment. No notion of "coldness" per se exists in thermal physics. $\endgroup$ Aug 15 '16 at 9:42

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