You wish to observe the progress of your vacuum pump in evacuating a tall bell j

Question

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 8.39 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. Answer as a %

Explanation / Answer

6.53 mm of mercury means 6.53 * 10^-3*1.36*10^4*10 Pa= 888.08 Pa. This pressure as % of atmospheric pressure of 1.01

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