If the air bubbles are introduced into the barometer tube then the height of the mercury column will .

increase

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decrease

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remain the same

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Solution

The correct option is B decrease
If air bubbles are introduced into the barometer tube, they will exert some pressure. In this case, the atmospheric pressure will be equal to sum of the pressures due to air inside the tube and of the mercury column.
Since atmospheric pressure is constant at a place, the height of the mercury column decreases as air is added to the barometer tube.

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