why do we use 1 g of water in one calorie definition and not I litre or milli litre?
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A calorie was originally defined as the amount of heat needed to raise the temperature of 1 gram of water 1 degree C under 1 atm pressure. However the specific heat of water changes with temperature, so it's best to use the "thermochemical" calorie definition: the amount of energy equal to exactly 4.184 joules.
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because 1 ml is used in math not in physucs
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