Question: When a mercury manometer is connected to a gas main, the mercury stands 40.0 cm higher in the tube that is open to the air

When a mercury manometer is connected to a gas main, the mercury stands 40.0 cm higher in the tube that is open to the air than in the tube connected to the gas main. A barometer at the same location reads 74.0 cm Hg. Determine the absolute pressure of the gas in cm Hg?

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