British Thermal Unit (BTU)

Heating · Introduction · printed page 110 (PDF page 111)

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Book index entries

British Thermal Unit BTU

Text in the illustration

+1° Fahrenheit
1 pound of water
one BTU is the amount of heat required to raise the temperature of 1 pound of water by 1° Fahrenheit

Generated explanation

The illustration explains a British Thermal Unit using a blue cube representing one pound of water. An upward arrow above the cube indicates a temperature increase of 1° Fahrenheit. A burning match below the cube symbolizes heat input, with an annotation defining one BTU as the heat required to produce that temperature rise. This is a conceptual explanation of heat measurement rather than a heating-system installation detail.

Components

burning match symbolic one-pound volume of water

Materials

water wooden match