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Unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree Centigrade at atmospheric pressure.

A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure;

Used by nutritionists to characterize the energy-producing potential in food.

An outdated unit of measuring energy and now replaced by the joule unit, one calorie is the amount of heat Energy required to heat 1 squared centimetre of water by 1 degree Celsius.