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    Question

    Perspiration cools the body

    because
    A the presence of water on the skin is cooling Correct Answer Incorrect Answer
    B evaporation requires latent heat Correct Answer Incorrect Answer
    C water has a high specific heat Correct Answer Incorrect Answer
    D water is a poor conductor of heat Correct Answer Incorrect Answer

    Solution

    Perspiration cools the body because evaporation requires latent heat. The heat from the body is absorbed to convert sweat into vapor, thereby cooling the skin. Information Booster:

    1. Latent heat of vaporization is the energy required to change liquid to vapor.
    2. Sweating is controlled by the hypothalamus.
    3. High humidity reduces evaporation and cooling efficiency.

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