BTU

British Thermal Unit

The British thermal unit (BTU or Btu) is a unit of energy. A BTU is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Melting a pound of ice at 32 °F requires 143 BTU.

One BTU is approximately:

   * The energy produced by burning one wooden match
   * 1,054—1,060 joules
   * 252—253 cal (calories, small)
   * 0.252—0.253 kcal (kilocalories)
   * 778—782 ft·lbf (foot-pounds-force)
   * 1 standard cubic foot of natural gas ≈ 1030 BTU