Question

What is the meaning of heat

Answer 1

Heat is the amount of energy that flows spontaneously from a warmer object to a cooler one. More generally, heat arises from many microscopic-scale changes to the objects, and can be defined as the amount of transferred energy excluding both macroscopic work and transfer of part of the object itself.

Answer 2

Heat is that form of energy that is transferred from a hot body to a cooler body, i.e, from a body at high temperature to a body at lower temperature.