heat of fusion

American  

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 Scientific  

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