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Energy and power
The BTU is regularly used in English-speaking metric countries. It is widely used in heating and air conditioning, and power and steam generation.
One BTU is the energy required to heat 1 avoirdupois pound of liquid water by 1 degree Fahrenheit, at a pressure of one atmosphere.
A 4inch wooden match that is completely burned generates approximately 1 BTU. one kilowatt-hour of electricity generates about 3,400 Btu, One pound of air-dried wood about 7,000 Btu, and a ton of coal about 20 million Btu
Used in the US, Canada and Caribbean to measure energy, and also used to help measure natural gas prices