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Discussion :: Heat and Mass Transfer

  1. According to Prevost theory of heat exchange

    2. A.

     It is impossible to transfer heat from low temperature source to t high temperature source
    B.

     Heat transfer by radiation requires no medium
    C.

     All bodies above absolute zero emit radiation
    D.

     Heat transfer in most of the cases takes place by combination of conduction, convection and radiation

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    Answer : Option C

    Explanation :

    According to Prevost theory of heat exchange Every material body, at any temperature above absolute zero, radiates heat to the surroundings and at the same time absorbs heat from the surroundings. The rate of emission of heat by a body depends upon its absolute temperature.

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