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Atmospheric Pressure

A manometer r...

Question

A manometer reads the pressure of a gas in an enclosure as shown in the figure. The absolute and gauge pressure of the gas in cm of mercury is Mercury (Take atmospheric pressure = 76 cm of mercury)

A

76, 20

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B

20, 76

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C

96, 20

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D

20,96

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Solution

The correct option is D 96, 20
Here, atmospheric pressure $P = 76$ cm of mercury In figure, Pressure head, $h = 20$ cm of mercury
Absolute pressure $= P + h = 76 + 20 = 96 c m$ of mercury
Gauge pressure $= h = 20 c m$ of mercury.

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