One thousand cards (qi ā NK m 4) is also called one card. A unit of heat, equal to 1000 calories, i.e. 1 kg of water to raise its temperature 1 degree Celsius (symbol is kilocalories). CAL is the abbreviation of Calorie, transliterated from English calorie (abbreviated as Cal). It is defined as the heat required to raise 1 gram of water at 1 atmospheric pressure. Calorie is an energy unit, which is still widely used in nutrition measurement and fitness manual. The international standard unit of energy is joule.

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