calorie, abbr. Cal, unit that heat power in the metric system. The measure of warmth is dubbed calorimetry. The calorie, or gram calorie, is the quantity of heat required to advanced the temperature the 1 gram the pure water 1°C. The kilocalorie, or kilogram calorie, is the quantity of heat required to raise the temperature the 1 kg that pure water 1°C; the is same to 1,000 cal. The kilocalorie is used in dietetics because that stating the warmth content that a food, i.e., the quantity of heat power that the food can yield as it passes with the body; in this context, the kilocalorie is usually called simply the calorie. The quantity of heat energy needed to effect a 1°C temperature boost in 1 gram of water varies with temperature (see heat capacity); hence the temperature range over i m sorry the heater takes location must be proclaimed to specify the calorie precisely. The 15° calorie, or regular calorie, is widely provided in chemistry and also physics; that is measured by heater a 1-gram water sample native 14.5°C to 15.5°C in ~ 1 setting pressure. The 4° calorie, also called the little calorie or therm, is measured native 3.5°C come 4.5°C (water is most dense at 3.98°C); the huge calorie, or Calorie, is equivalent to 1,000 tiny calories. The median value the the calorie in the range 0°C to 100°C is called the typical calorie; that is 1⁄100 that the energy needed to warmth 1 gram of water from its melting suggest to its boil point. The calorie may additionally be characterized by to express its value in some other power units. The 15° calorie is identical to 4.185 joules (J), 1.162×10−6 kilowatt-hours, 3.968×10−3 British thermal units, and also 3.087 foot-pounds; the 4° calorie equates to 4.204 J; and also the typical calorie equates to 4.190 J. Two other calories sometimes used are the International vapor Table calorie, same to 4.187 J, and the thermochemical calorie, equal to 4.184 J. Once the calorie is provided for precision measurement of heat energy, the particular calorie gift used need to be specified.

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