If we stand near a campfire and we feel the heat without touching it is convection method, heat is coming through radiation.
In thermodynamics, heat has a very precise definition that differs from how we generally use the word. When two systems with various surface temperatures come into touch with one another, heat is the thermal energy that is transmitted. The letters q or Q stand for heat, and the unit of measurement for heat is joules.
Heat is sometimes referred to as a process quantity since it is defined in the context of a process through which energy can be conveyed. The heat that a hot cup of coffee delivers to your palm may be debated, but the heat that the cup of coffee holds is not. Another noteworthy quality is heat..
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