Calories

From Glossary of Meteorology
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calorie

(Abbreviated cal.) A unit of energy defined as that amount of energy required to raise the temperature of one gram of water by one degree Celsius (the gram-calorie or small calorie), equal to 4.1855 joules.

The kilogram calorie or large calorie (Kcal, kg-cal, or Cal) is 1000 times as large as a calorie.