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Ther′mal U′nit.

In British parlance, that quantity of heat which corresponds to an interval of 1° Fah. in the temperature of 1 pound avoirdupois of water at 39.10° Fah.

It is to the French thermal unit as 1:3, 96832.

The French unit is 1° Centigrade in 1 kilogramme of water.

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