Question

Why Mercury is preferred in Barometers ???

Answer 1

Mercury is used in Barometers because it is a very heavy liquid and therefore, the atmospheric pressure can only support a column of Mercury about 76 cm.

This is convenient as glass tubes of this size can easily be made and handled.

An barometer is an instrument used to measure atmospheric pressure. It consists of long and thin tube filled with Mercury and closed at one end. The open end of the tube is placed in a small trough full of Mercury. The pressure exerted by air on the Mercury of trough is able to hold certain height of the Mercury column.

when the air pressure is low, the Mercury will move down, and when the air pressure increases the height of the Mercury column increases. We can measure the pressure by the weight of Mercury column in mm of Hg.

At sea level it is 760 mm of Hg« —( Mercury symbol).

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Answer 2

Mercury does not evaporate easily so very little mercury vapor enters the vacuum above the mercury in the tube. Mercury being a metal shines brightly and so can be used to read the markings on the tube easily.so Mercury (Hg) is preferred in a barometer because it is very dense (13.6 times].

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