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In the figure, the chamber A contains a gas, movable chamber B is placed on the top of the gas and it contains $\mathrm{n}$ metal balls. The weight of chamber B is supported by the gas. Chamber $\mathrm{C}$ has vacuum. Let the gas be in equilibrium at pressure $\mathrm{P}$. Let $\mathrm{P}^{\prime}$ be the pressure if one of the balls is taken away. Find $\left(\mathrm{P}-\mathrm{P}^{\prime}\right) / \mathrm{P}$.

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The correct answer is:
$1 / \mathrm{n}$
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