how is the calorie related to the joule? what is the kcal used for
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The calorie was originally defined as the amount of heat required at a pressure of 1 standard atmosphere to raise the temperature of 1 gram of water 1° Celsius. ... Since 1925 this calorie has been defined in terms of the joule, the definition since 1948 being that one calorie is equal to approximately 4.2 joules.
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Calories is used for measuring energy. Calories and Joules have the same unit (J) .
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