Question

Why internal energy is associated with constant volume?

Answer 1

Internal energy changes. Thermodynamics is chiefly concerned only with the changes, ΔU, in internal energy. When a closed system receives energy as heat, this energy increases the internal energy. It is distributed between microscopic kinetic and microscopic potential energies.

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Answer 2

Internal energy changes. Thermodynamics is chiefly concerned only with the changes, ΔU, in internal energy. When a closed system receives energy as heat, this energyincreases the internal energy. It is distributed between microscopic kinetic and microscopic potential energies.

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