British Thermal Unit Mean

**Semantic type:** Quantitative Concept

**Definition:** A non-SI unit of energy equal to 1/180 of the amount of heat required to raise the temperature of one pound avoirdupois of air-free water from 32 to 212 degrees Fahrenheit at a constant pressure of one atmosphere. Mean British thermal unit is equal to 1.05587 kJ.

**Synonyms:** - B.T.U. (mean) - B.Th.U. (mean) - BTU (mean) - Btu (mean) - Btu_m - [Btu_m] - [Btu_m] - mean British thermal unit - mean British thermal unit