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When gas expands in a cylinder with radius r, the pressure
at any given time is a function of the volume: P = P(V).
The force exerted by the gas on the piston (see the figure) is
the product of the pressure and the area: F = mr*P. Show
that the work done by the gas when the volume expands
from volume V, to volume Vz is
w = (* PdV
Jv.
V
piston head

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Pls explain it in terms of P and V also if possible and in detail im a little weak.
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