Q:

Except for one situation described below, water molecules changing state from liquid to gas are involved in the cooling effect. Which one?

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Except for one situation described below, water molecules changing state from liquid to gas are involved in the cooling effect. Which one?


  1. a cold wind blowing against your skin.
  2. drying off after a swim.
  3. the evaporation of sweat.
  4. the exhalation of breath from the lungs.

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A: A cold wind cools us by convection. It continually removes the air that has been warmed by contact with the skin. 

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