What is British thermal unit (Btu)?
Unit of measurement of heat. It is how much heat is needed for raising the temperature of 1 lb of water by 1°F. 1 BTU is equal to 1,055 J or 252 cal.
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Unit of measurement of heat. It is how much heat is needed for raising the temperature of 1 lb of water by 1°F. 1 BTU is equal to 1,055 J or 252 cal.
← Back to Solar Energy Glossary