What will be the mathematical form of the first law of thermodynamics for a system whose variation of volume by pressure is shown?
Correct answer: D. Q = W
- A. Q = U
- B. U = W
- C. Q = U/W
- D. Q = W
Explanation
Since it is an isothermal process, there is no change in temperature hence the internal energy is constant. U = 0Hence, the equation will be: Q = WFor all isothermal compression or expansion of ideal gases.
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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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