An abbreviation for 'British Thermal Unit,' a measurement of heat energy commonly used in HVAC and appliance specifications.
An acronym from the full term 'British Thermal Unit,' which was standardized in the 19th century as a way to measure heat output. It remains widely used in English-speaking countries despite the metric system.
The BTU is a wonderfully stubborn unit—defined as the heat needed to raise one pound of water by one degree Fahrenheit—proof that Americans and the British are just too practical to fully switch to metric, at least for comfort!
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