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Heat is a form of energy. In terms of kinetic theory it can be defined as

the sum of kinetic energy of molecules in a sample of a substance.

-- Its SI unit is the Joule.

-- Its CGS unit is the erg = 10-7 joule.

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'Heat' is energy in transit between a warmer body and a cooler body. The definition given in the original answer is for 'internal energy', not heat.

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