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why is the fluid in a barometer mercury rather than water or another liquid

by Adrianna Bednar DVM Published 3 years ago Updated 2 years ago

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. A barometer using water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference.

Full Answer

Why Mercury is not used in barometer instead of water?

water cannot be used as barometric liquid because it's density is lower than Mercury . water's density is 1000 gram per cubic meter. hence it requires a barometer whose height is around 11 meters. why mercury is used in manometer instead of water?

What is the liquid inside of a barometer?

Barometric Liquid ( Defined ) A barometer is an instrument used to measure atmospheric pressure and the liquid inside it used to measure the atmospheric pressure is barometric liquid. Barometer uses Mercury ( A highly Poisonous liquid metal) as it's liquid.

Why can't water be used as a barometric liquid?

water cannot be used as barometric liquid because it's density is lower than Mercury . water's density is 1000 gram per cubic meter. hence it requires a barometer whose height is around 11 meters.

Can a barometer be used with water?

A barometer using water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference. Click to see full answer. Similarly, why is water not used as a barometric liquid?

Why is mercury preferred over water in a barometer?

The correct answer is Mercury has high density and low vapour pressure. Mercury is used in barometers and not water. This is because the high density of mercury gives a reasonable height of the column to measure atmospheric pressure.

Why is water not used in barometer liquid?

Water is not a suitable barometric liquid because: (i) The vapour pressure of water is high, so its vapours in the vacuum space will make the reading inaccurate. (ii) Water sticks with the glass tube and wets it, so the reading becomes inaccurate.

Could water be used to make a barometer?

Water cannot be used as a barometric liquid because its density is lower than Mercury. Water's density is 1000 grams per cubic meter. hence it requires a barometer whose height is around 11 meters.

Why is the reading of a mercury barometer always less than actual pressure?

Mercury barometer reads less than the actual reading because mercury is dry liquid. Therefore, as a result of surface tension the level of the fluid falls in the barometer. Hence, reads less.

How to measure atmospheric pressure?

1)Mercury is more dense. Its relative density is 13.534 times that of water. So, to measure the atmospheric pressure, which is 760 mm of mercury you need a barometer ,with mercury, of length slightly more than 0.76 meter, say one meter to cover the special cases of some higher pressure. If you use water, you have to have the length of barometer of length (or height) 13.534 times the length of mercury barometer, which may be more than 11 meter in length.#N#2)Further mercury, being a metal has the shining quality which highlight its reading clear.#N#3)Also mercury, having comparatively lower specific heat and good conductor of heat, could come to the same temperature of the atmosphere more quickly.

Is mercury a good conductor of heat?

3)Also mercury, having comparatively lower specific heat and good conductor of heat, could come to the same temperature of the atmosphere more quickly.

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