British thermal unit (Btu) The quantity of heat needed to raise the temperature of one pound of water one Fahrenheit degree (from 62 to 63 ·F).
C ...
British thermal unit A unit of energy defined as the heat required to raise the temperature of one pound of water one degree Fahrenheit. It is equal to 252.1 calories or to 1055 joules.
 See also: Pressure, Severe weather, Heat, Mercury barometer, Evaporation
  
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