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´ñ±Û 7
À͸í
2012-07-17 13:02:10
6/The small calorie or gram calorie (symbol: cal)[2] approximates the energy needed to increase the temperature of 1 gram of water by 1 ¡ÆC at 1 atmosphere of pressure. This is about 4.2 joules.
The large calorie, kilogram calorie, dietary calorie, nutritionist's calorie or food calorie (symbol: Cal)[2] approximates the energy needed to increase the temperature of 1 kilogram of water by 1 ¡ÆC. This is exactly 1,000 small calories or about 4.2 kilojoules. :
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