The diagram shows a simple mercury barometer. | vedclass

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(C) The pressure exerted by the mercury column is given by $P = \rho gh$,where $\rho$ is the density of mercury,$g$ is the acceleration due to gravity

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Evaporation of mercury from the barometer reservoir

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(C) The pressure exerted by the mercury column is given by $P = \rho gh$,where $\rho$ is the density of mercury,$g$ is the acceleration due to gravity,and $h$ is the height of the mercury column. This pressure balances the atmospheric pressure $(P_{atm})$.$1$. Changes in atmospheric pressure $(P_{atm})$ directly cause the height $h$ to change to maintain equilibrium $(P_{atm} = \rho gh)$.$2$. Changes in the value of $g$ will cause the height $h$ to adjust to keep the pressure $\rho gh$ equal to $P_{atm}$.$3$. Leakage of air into the tube introduces air pressure above the mercury column,which pushes the mercury down,thus changing the height $h$.$4$. Evaporation of mercury from the reservoir does not change the atmospheric pressure acting on the surface of the reservoir,nor does it change the density or the gravitational acceleration. Therefore,it does not cause the height of the mercury column to vary.

The diagram shows a simple mercury barometer. Which of the following does not cause the height of the mercury column to vary?

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