Question

Briefly describe the construction of mercury barometer

Answer 1

The mercury barometer consists of a long glass tube containing mercury whose one side is sealed and the other is inverted on a cup also containing mercury.The mercury falls into the cup but after sometime it becomes constant.So it can determine atmospheric pressure.
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Answer 2

Answer:

Explanation:

A simple barometer has a hard glass tube of about 1m length closed at one end.The tube is completely filled with mercury such that no air bubble remains in the tube.The open end of the tube is closed with thumb and then the tube is made upside down several times so as to force out any air bubble which might have entered in it.The completely filled tube with its open end closed by thumb is then inverted into a trough of mercury in such a way that the open end of the tube is well immersed in mercury and the tube stands vertical.Now the  thumb is removed. Care is taken that no air enters the glass tube.

It is seen that the mercury level in the tube falls till its height above the mercury level in the trough becomes nearly 76m.

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