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Two gases have the same initial pressure...

Two gases have the same initial pressure, volume and temperature. They expand to the same final volume, one adiabatically and the other isothermally

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Figure shows the P-V diagrams for two gases expanded from volume V to 2V. As an adiabatic is steeper than an isotherm, so the adiabatic expansion curve AB lies below the isothermal expansion curve AC.

`P_B` and `P_C`are the final pressures for adiabatic and isothermal expansions respectively. Clearly,`P_C gt P_B`. Hence the final pressure is greater for the isothermal expansion.
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