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Calories and Joules
 

In chemistry we measure heat using two different units: calories and joules. A calorie is defined as the amount of energy needed to raise the temperature of one gram of water one degree Celsius. The “calorie” you are most familiar with is used to measure the energy content of food. This “calorie” is actually a kilocalorie (1000 calories) and is written with a capital C to distinguish it from the calorie used in chemistry.
The Calories listed for this candy bar are actually kilocalories.
The other unit used to measure heat is the joule. The joule is the SI (System International) unit. In this juice label from Amsterdam you can see that energy (“energie”) is given in kilojoules and kilocalories.
To convert between calories and joules:
1 Calorie (kcal) = 1000 calories (cal) = 4184 joules (J) = 4.184 kilojoules (kJ)
or use this chart:

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