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Glossary

Terms for Architecture, Green Building & Energy


This glossary includes more than 300 solar terms, as well as hundreds of additional sustainable design and construction terms.

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Btu (British Thermal Unit)

Definition 1: The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit; equal to 252 calories.

Definition 2: A measurement of energy representing the amount of heat needed to raise 1 pound of water by 1 degree Fahrenheit. About the same amount of energy released by a single lit match.