British Thermal Unit (BTU) 10
British Thermal Unit (BTU) 10 : The quantity of heat required to raise the temperature of one pound of water 1?F at the pressure of 1 atmosphere and temperature of 60?F. Note: A British thermal unit is equal to 1055joules, 1. 055 kilo-joules, and252. 15calories. NFPA 921, 2004ed