British thermal unit(redirected from British Thermal Units)
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Related to British Thermal Units: BTUs
British Thermal Unit
The energy needed to raise the temperature of one pound of water one degree Fahrenheit. It is used in the United Kingdom, the United States, and a few other countries to measure the energy used by appliances like heaters and air conditioners. In the metric system, the equivalent of the British thermal unit is the joule. It is abbreviated BTU.