In which of the following cases the level of mercury in a barometer would fall It is taken from sea ...........

Environment and Ecology (Easy) Envirnment and Climate Change

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In which of the following cases, the level of mercury in a barometer would fall?

It is taken from sea level to a high altitude

A storm is approaching

Radius of barometer is increased

Select the correct option from the codes given below:

Only 1

Only 1 & 2

1, 2 & 3

Only 1 & 3

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Explanation:

Mercury barometer is used for measuring atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude. There is no change in the mercury level when the radius of tube in the barometer is increased.