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Calorie

Calories are units of energy. Various definitions exist but fall into two broad categories.

  • The small calorie or gram calorie (symbol: cal) is 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.
  • The large calorie or kilogram calorie (symbol: Cal), also known as the food calorie and similar names, 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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