A student performs an experiment using a barometer as shown in the figure below. The atmospheric pressure is given as 76 cm of Hg $(h_{0})$ and the rise in height is 5 cm. What will be the pressure of the gas?

81 cm of Hg

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70 cm of Hg

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71 cm of Hg

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75 cm of Hg

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Solution

The correct option is C
71 cm of Hg

If the pressure in the container is less than the atmospheric pressure, the mercury level will be higher on the container side and the difference in pressure must be subtracted from the atmospheric pressure.
The gas pressure in the tube is, P = $h_{0}$ - h = 76 cm of Hg - 5 cm = 71 cm of Hg.

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A student performs an experiment using a barometer as shown in the figure below. The atmospheric pressure is given as 76 cm of Hg (h0) and the rise in height is 5 cm. What will be the pressure of the gas?

A student performs an experiment using a barometer as shown in the figure below. The atmospheric pressure is given as 76 cm of Hg $(h_{0})$ and the rise in height is 5 cm. What will be the pressure of the gas?