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Thermodynamics deals with the equilibrium states of matter and can be extended to define the driving forces for changes from one equilibrium state to another when a system is subjected to external changes. When a system changes from one equilibrium state to another, thermodynamics also helps to determine the quantity of work & heat interactions according the the path taken to transition from the initial state to the final state.

Heat is the movement of energy from one system to another due to a temperature gradient. It is frequently confused with "internal energy" or "thermal energy". We think of a system as being "hot" when it has a lot of internal energy that it can transfer to another system which is at a lower temperature. When the energy moves, it is called heat. As an analogy, we can compare heat to rain. When the water is in motion from the clouds to the ground, we call it rain. The rain moves due to a potential energy gradient between the clouds and the ground due to gravity. When the water is tied up in the clouds, it isn't rain. When it is pooling on the ground it isn't rain. It is only rain when it is moving between the two. Likewise heat is the energy MOVING from one system to another. You can heat a system up by transferring energy into it via heat - or you can add the energy to it via doing work on it. Once the energy is added, the internal energy has increased - but it doesn't have more "heat".

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