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KD Grayson
Answered 2020-10-31 13:19:19

A BTU is the amount of heat required to heat or cool 1 lb of water 1 degree, water freezes at 32F so it should not require any more than 1 degree to be below freezing.

There are 8lbs in1 gallon of water, so 8 BTU's will lower a gallon(8 lbs) 1 degree.

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Answered 2007-01-24 14:49:37

You would need to remove approximately 1200 BTUs of heat to convert a gallon of water to ice. There are 8.34 lb in a gallon of water, which converting to lb-moles is 0.463. The latent heat of crystallization for water is -2583.4 BTU/lb-mole. Multiplying the two together and you get -1197 BTUs, which means you need to remove that amount of heat to convert the gallon of water to ice.

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