A closed container is fully insulated from outside. One half of it is filled with an ideal gas $X$ separated by a plate Pfrom the other half $Y$ which contains a vacuum as shown in figure. When $P$ is removed, $X$ moves into $Y$. Which of the following statements is correct?
Medium
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Work done by a gas is given by$:$
$w=\int P d V$
Work done by $x$ is against vacuum, hence $P=0$
$w=\int P d V=\int 0 d V=0$
Hence no work is done by or done on $x$.
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