What happens to the barometric height if a faulty barometer is pushed down into the mercury trough?

The height will decrease

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The height will increase

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The height will neither decrease nor increase

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The height cannot be determined

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Solution

The correct option is A
The height will decrease

In an accurate barometer, the space above the mercury column in the tube is a vacuum. If air enters into that space or a drop of water gets into the tube, it will immediately change into vapor in vacuum space and the air will exert pressure on mercury column due to which the barometric height decreases. The barometric height of a faulty barometer will be less than the actual atmospheric pressure.

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Similar questions

Q. A barometer has become faulty because some air has leaked into the space above the mercury column. The height of the mercury column is

70 c m

and the length of the space above the mercury is

10 c m

. The barometer space is pushed further down into the mercury trough. The length of space above mercury reduces to

6 c m

and the height of mercury column is found to decrease to

67 c m

. This information shows that the true atmospheric pressure must be:

In a simple barometer, some air is trapped in the space above the mercury column. Let H be the height of the mercury column initially. When the tube is further pushed into the vessel, what happens to the height of the mercury column ‘H’ in the tube?

Q. How is the barometric height of a simple barometer affected if
(a) its tube is pushed down into the trough of mercury?
(b) its tube is slightly tilted form vertical?
(c) a drop of liquid is inserted inside the tube?

What will happen to the height of the mercury column if we take a Barometer inside a deep pit/trench?

Q. The moisture present in mercury ______ the barometric height of simple barometer

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