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Q.

A cylinder of 10 litre capacity filled with air at normal pressure is connected with an evacuated cylinder of 30 litre capacity. Find the resulting pressure.(in cm of Hg)

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answer is 19.

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Detailed Solution

Applying Boyle’s law,
$\begin{array}{l} P_{1} V_{1} = P_{2} V_{2} \\ V_{2} = 10 + 30 = 40 litre \\ 76 \times 10 = P_{2} \times 40 \\ P_{2} = 19 cm of Hg \end{array}$

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A cylinder of 10 litre capacity filled with air at normal pressure is connected with an evacuated cylinder of 30 litre capacity. Find the resulting pressure.(in cm of Hg)