What will happen if there are air bubbles in the tube while measuring atmospheric pressure?

Mercury will begin to get heated

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It will add more unwanted pressure

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Both A and B

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None of these

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Solution

The correct option is B
It will add more unwanted pressure

The air bubbles will add more pressure on top of the mercury in the tube and the height of the mercury column decreases.
This will give a wrong reading or measurement of atmospheric pressure.

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