Weber, Harold C. Formerly, Chemical Engineer, Boston, Massachusetts.
Steele, William A. Formerly, Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania.
Last reviewed:November 2019
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Energy that is in transit, but unassociated with matter, and that results from a temperature difference between the source from which the energy is coming and the sink toward which the energy is going. When two objects or systems with differing temperatures, or amounts of inherent energy, are in contact, heat transfers from the higher-temperature to the lower-temperature object or system. In general, the temperature of the former (the source), decreases as the temperature in the latter (the sink) increases (see illustration). The matter in the objects can undergo a phase transition, for instance from solid to liquid, due to the flow of heat energy and not experience a change in temperature. See also: Amorphous solid; Crystal; Energy; Heat transfer; Liquid; Matter (physics); Phase transitions; Temperature
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