Question

Definition of heat in terms of thermodynamics

Answer 1

Heat may be defined as energy in transit.
Word heat is used only if there is a transfer of energy from one thermodynamic system to the another.
When two systems at different temperatures are kept in contect with each other then after some time temperatures of both the syatems become equal and this phenomenon can be described by saying that energy has flown from one system to another.
This flow of energy from one system to another on account of temperature difference is called heat transfer.