Why does heat consider as a form of energy?

Answer 1

Energy is defined as the ability to do work.

When a body is supplied with heat,the body gains the tendency to do work.thus heat has the capacity to do work hence heat is considered as a form of energy

Answer 2

Heat is considered a form of energy because it is the transfer of thermal energy between objects due to a temperature difference. The movement of atoms and molecules within an object generates heat energy, which can be transferred through conduction, convection, or radiation. This transfer of energy can be harnessed to perform work or create changes in the system.