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A kilojoule is a unit of heat. Joule is a unit of heat and work in international units. A kilojoule refers to a thousand joules.

Nowadays, kilojoules are often used to measure the calories contained in food and the calories consumed in a certain exercise unit time. Women generally control their weight by controlling the calories consumed in food and the calories consumed in exercise.

Heat refers to the energy transferred by temperature difference between the thermal system and the outside world. Heat is a process quantity, so heat can only be said to be "absorbed" and "released". You can't say "contain" or "have". And this transfer process is called heat exchange or heat transfer. The unit of heat is joule (j).

The relationship between heat and internal energy is just like the relationship between work and mechanical energy. Heat is a measure of the internal energy change of an object. If the thermal balance between the two areas has not been reached, then the heat will be transferred to the other side with low temperature at the place with high temperature between them. Any substance has a certain amount of internal energy, which is related to the disorderly movement of atoms and molecules that make up the substance. When two substances with different temperatures are in thermal contact, they exchange internal energy until their temperatures are the same, that is, they reach thermal equilibrium.