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What is Heat?

The molecules in a body are in constant motion. Their motion could be in the form of vibration, rotation or translation. The molecules acquire kinetic energy by virtue of their motion. The molecules also possess potential energy. So, heat energy contained by a body is the sum of total energies of all its molecules.
Total energy of a molecule = kinetic energy of a molecule + potential energy of a molecule.
The total energy of a substance is also called the thermal energy of substance.
Since heat, a form of energy, is able to do work, it has the SI unit of work, i.e., joule (J). Another unit called ‘calorie’ is also used as the unit of heat. The amount of heat required to raise the temperature of one gram of water by one degree Celsius is called a calorie.
1 calorie = 4.18 joule

One kilocalorie is the amount of heat required to raise the temperature of 1 kg of water through 1 °C.

1 kilocalorie = 1000 calorie

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