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A unit of heat originally defined as the amount of heat required to raise the temperature of water through one degree centigrade (the gram-calorie or small calorie), but this proved to be insufficiently precise. The 15 gram-calorie (cal 15) is the amount of heat required to raise the temperature of one gram of water from 14.5 to 15.5C, and is equal to 4.1855 joules. The kilogram calorie or large calorie (Kcal, kg-cal, or Cal) is 1,000 times as large as a calorie.

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