Discussion
Which law of thermodynamics is used to understand the concept of energy conservation ?
Answer: B
Energy conservation is expressed by the first law of thermodynamics.
The first law states that energy can be neither created nor destroyed, only converted from one form to another. For a closed system the change in internal energy equals the heat added minus the work done by the system:
\[ \Delta U = Q - W \]
The zeroth law defines thermal equilibrium and temperature, the second law concerns entropy and the direction of natural processes, and the third law concerns entropy as temperature approaches absolute zero.
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