Question

What is the difference between water pressure and mercury pressure in barometer?

Answer 1

Hey there

Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. ... The actual pressure is known as the absolute pressure; the pressure difference between the absolute pressure and atmospheric pressure is called the gauge pressure.

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MSAVAGE

Answer 2

A standard mercury barometer to measure atmospheric pressure is a tube with one end sealed. ... A barometer using water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference. This is because mercury is 13.6 times more dense than water.