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Heat Definition and Explanation PDF | Download eBooks

Learn Heat definition in biology with explanation to study “What is Heat”. Study heat explanation with biology terms to review biology course for online degree programs.

Heat Definition:

  • Thermal energy in transfer from one body of matter to another is defined as heat.

    Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson

Heat Explanation:

The energy transferred between two substances at different temperatures is called heat. Heat is usually measured in units of energy like calorie or joules. The direction of energy flow is always from the higher temperature to the lower. Although heat flows spontaneously from a hotter body to a cooler one, it is possible to construct a heat pump; a refrigeration system expends work to transfer energy from a colder body to hotter surroundings; such a device can also transfer energy from colder surroundings to a hotter body.

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