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The British thermal unit (BTU or Btu) is a unit of energy used in the power, steam generation, and heating and air conditioning industries. Although it is still used 'unofficially ... - EIA Energy Kids Page
USING BRITISH THERMAL UNITS (BTU) TO COMPARE ENERGY . Physical units reflect measures of distances, areas, volumes, heights, weights, mass, force, impulse and energy. - British Thermal Unit (BTU), MBTU, MMBTU
British Thermal Unit (BTU), MBTU, MMBTU. A standard unit of measurement used to denote both the amount of heat energy in fuels and the ability of appliances and air conditioning ...
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British Thermal Unit
Encyclopedia Article
British Thermal Unit, in science and engineering, a unit measurement of heat or energy, usually abbreviated as Btu or BTU. One Btu was originally defined as the quantity of heat required to raise the temperature of 1 lb (0.45 kg) of water from 59.5° F (15.3° C) to 60.5° F (15.8° C) at constant pressure of 1 atmosphere; for very accurate scientific or engineering measurements, however, this value was not precise enough. The Btu has now been redefined in terms of the joule as equal to 1055 joules; in engineering, a Btu is equivalent to approximately 0.293 watt-hour.
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