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A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. Correct Answer The mercury level starts rising

As the pump removes the air from the bell jar the pressure obviously reduces around the barometer. The reduction in pressure around the barometer leads it to expand. As the pump removes air from the jar, the mercury level rises.

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