Two identical gases expand i) isothermally and ii) adiabatically. Work done is more in:
Correct answer: A. Isothermal process
- A. Isothermal process
- B. Adiabatic process
- C. Neither of these options is correct.
- D. Equal in both cases
Explanation
For an expansion from the same initial state to the same final volume, the pressure in an isothermal process remains higher than in an adiabatic process (which cools down). Therefore, the area under the P-V curve, representing work done, is greater for the isothermal process.
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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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