Question

what is calorie...................
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Answer 1

The calorie is a unit of energy widely used in nutrition. For historical reasons, two main definitions of calorie are in wide use. The small calorie or gram calorie (usually denoted cal) is the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius (or one kelvin).

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Answer 2

A calorie is a unit of energy widely used in nutrition .