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Heat is a form of energy associated with the motion of atoms or molecules. For example, when we compress air, it becomes hot. This is caused by the molecules in air colliding together in a compressed space. Heat is generated as a result of these collisions.

Heat flows from a hotter to a colder body, and is transmitted in the following ways:

  • By conduction through solids
  • By convection through fluids
  • By radiation through empty spaces

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