British Thermal Unit

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British Thermal Unit

(abbr Btu) 

The amount of heat required to raise 1 pound of water at 60 degrees F, 1 F.
This unit is defined for various temperatures, but the general usage seems to be to take the Btu as equal to 252 15 gram-calories or 1055 joules.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use