Problem: A mercury barometer.What happens to h the height of the mercury column, if the atmospheric pressure increases?

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FREE Expert Solution

We have to determine what would happen to the height of mercury column if the atmospheric pressure is increased.


A barometer is a device that is used to measure air pressure.

It consists of a tube filled with mercury and placed inverted into a tub or mercury. The pressure exerted on the surface of the mercury supports the mercury column to a particular height.

The pressure is related to the height of the mercury column by this formula:

P = ρgh

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Problem Details

A diagram shows a glass tube filled with mercury and inserted into a dish of mercury. Pressure is exerted on the surface of the mercury by the atmosphere and by the mercury in the tube. The mercury in the tube rises to height h; above the mercury in the tube is vacuum.
A mercury barometer.

What happens to h the height of the mercury column, if the atmospheric pressure increases?