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Aakshi Gautam posted an Question

December 06, 2019 • 02:34 am

5 points

IIT JAM
Chemistry (CY)

Here what is intermediate Isothermal expansion ?

here what is intermediate Isothermal expansion ? nd why pext is equal to P what represents here intermediate Isothermal expansion??

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Eduncle

Dear Student,

If the gas expands reversibly, the external pressure (Pext) can be replaced by a single value (P) which represents both the pressure of the gas and the external pressure.
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why we called this intermediate isothermal
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Dear Student,

Work done in the irreversible isothermal expansion : Two types of irreversible isothermal expansions are observed, i.e., (a) Free expansion and (b) Intermediate expansion. In free expansion, the external pressure is zero, i.e., work done is zero when a gas expands in a vacuum. In intermediate expansion, the external pressure is less than gas pressure. So, the work done when the volume changes from V₁ to V₂ is given by

W = (-int_{v1}^{v2}P_{ext} imes dV) = - P_ext(V₂ - V₁)

Since P_ext is less than the expressure of the gas, the work done during intermediate expansion is numerically less than the work done during reversible isothermal expansion in which P_ext is almost equal to P_gas.

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