heat of fusion

noun

, Physics.

1. the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature: equal to the heat of solidification.

heat of fusion

1. The amount of heat required to convert a solid at its melting point into a liquid without an increase in temperature. Liquids release the same amount of heat when they solidify.
2. See also heat of vaporization

Example Sentences

When the handle of the machine is rapidly turned the wire glows, first with a red heat, then with a white heat, and finally with the heat of fusion.

From Project Gutenberg

The number of units of heat required to melt a unit mass of ice is called the heat of fusion of water.

From Project Gutenberg