CALORIE

The unit by which heat is measured. The ‘small calorie’ is the amount of heat required to raise 1 gram of water 1°O. ‘The ‘great calorie’ is the amount of heat required to raise 1 kilogram of water 1° C. and is therefore equal to 1,000 small calories. It is also approximately equal to the heat reuired to raise 1 lb. of water 4° F, and is therefore hed PASS ag equal to 4 B.T.U’s, the factor generally used being 3.968. The ‘mean calorie’ is obtained by dividing the amount of heat required to raise 1 gram of water from 0° to 100° C. by one hundred. It is not nece arily the same as that required to raise 1 gram of water 1° ©. because the specific heat rai water varies slightly with its temper are.