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calorie
Unit used in measuring the energy of heat or chemical energy. A "small calorie" is the heat needed to heat up one gram of water by 1 degree Celsius (centigrade) at 50°C. It is equal to 4.1855 joules.
One kilocalorie or "big calorie" (Cal) equals 1,000 calories and is the unit usually used in describing the energy content of food. To confuse matters, dietary Calories are almost never capitalized as they should be, and are often mistaken for calories.
Related categories
• HEAT AND THERMODYNAMICS
• UNITS
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