The difference in the heights of mercury...

The difference in the heights of mercury levels in an open end manometer connected to a gas chamber is found to be 175 mm. If the height of mercury level in the smaller limb is more as compared to that in the longer limb and the atmospheric pressure is 755 mm, what is the pressure of the gas ?

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Verified by Experts

Since the height of mercury column in the shorter limb is more, the pressure of the gas is less than the atmospheric pressure. Hence
`P_(gas) = P_(atm) - P_(Hg) = 755 - 175 = 580 mm` of Hg

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