traditionally energy is measured in calories (one calorie is the amount of heat energy needed to increase the temperature of 1cm3 of water by 1 degree celceus)
food labels normally display units of 1000 calories , called kilocalories ( also called Calories with a capital C)
units for energy are joules J , 4.18 joules = 1 calorie.
the Kilojoule ( 1Kj = 1000 calories ), is used extensively in stating the energy conents in foods
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