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In a U-tube barometer, some air was left above the mercury in the closed tube. The...

In a U-tube barometer, some air was left above the mercury in the closed tube. The difference in height between the column of mercury in the closed tube and im the open thbe is 75.6 cm when the atmospheric pressure is 78.9 cm of mercury. Calculate the air pressure in the space above the mercury in a closed tube. Express the presshre in dynes/cm^2

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