Vacuum Pump

You wish to observe the progress of your vacuum pump in evacuating a tall bell jar for the purpose of demonstr?

You wish to observe the progress of your vacuum pump in evacuating a tall bell jar for the purpose of demonstrating that sound waves do not travel in a vacuum. So you place a mercury barometer inside the bell jar and follow the height of the mercury column as the pump chugs away. When you observe a height of 8.09 mm, what fraction of atmospheric pressure, expressed as a percentage, have you achieved in your bell jar? The density of mercury is 1.36 × 104 kg/m3 and standard atmospheric pressure is 1.01 × 105 Pa.

8.9 mm Hg is (to engineering accuracy) 8.9Torr. Atmospheric pressure is 760 Torr giving your required percentage as 890/760 or 1.17%

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