I get that is has something to do with energy, but so do a lot of things.
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A unit that measures an amount of energy, just like the joule. Specifically, 1 calorie (as used in food labeling; there’s also the 1/1000 “small” calorie) is the amount of energy needed to heat 1 kilogram of water by 1 degree Celsius (=~ 4.19 kilojoules).
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