The heat transfer in a process where volume remains constant is equal to:
Correct answer: A. Change in internal energy
- A. Change in internal energy
- B. Work done
- C. Change in pressure
- D. Change in temperature
Explanation
In an isochoric process, volume is constant, so no work is done (W = PΔV = 0). By the first law of thermodynamics (ΔU = Q - W), the heat added (Q) equals the change in internal energy (ΔU).
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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