Calorie

Rare card · No. 42939

The calorie is a unit of energy that originated from the caloric theory of heat. The small calorie or gram calorie is defined as the amount of heat needed to raise the temperature of one milliliter of distilled water by one degree Celsius (or one kelvin). In the US, the term "Calorie" when used in nutrition refers to a kilocalorie (1 kcal = 1000 cal). In nutrition and food science, the term calorie and the symbol cal may refer to the large unit or to the small unit in different regions of the world. It is generally used in publications and package labels to express the energy value of foods in per serving or per weight, recommended dietary caloric intake, metabolic rates, etc. Some authors recommend the spelling Calorie and the symbol Cal (both with a capital C) if the large calorie is meant, to avoid confusion; however, this convention is often ignored. In physics and chemistry, the word calorie and its symbol usually refer to the small unit, the large one being called kilocalorie (kcal...

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