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A calorie is a unit of energy. Various definitions exist but fall into two broad categories. The first, the small calorie, or gram calorie (symbol: cal), is defined as the approximate amount of energy needed to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere. is defined in terms of the kilogram rather than the gram. It is equal to small calories or 1 kilocalorie (symbol: kcal).

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