Question

What is Mercury barometer
Explain in construction, working and principle?? With diagram

Answer 1

Answer:

major reference. In barometer. In the mercury barometer, atmospheric pressure balances a column of mercury, the height of which can be precisely measured. To increase their accuracy, mercury barometers are often corrected for ambient temperature and the local value of gravity.

Explanation:

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Answer 2

Mercury Barometer:

Mercury Barometer is the simplest device to measure atmospheric pressure at a location. It consists of a glass tube closed at one end immersed in a container filled with mercury. Because of the atmospheric pressure mercury rises in the tube.

Principle of a mercury barometer:

A Mercury Barometer works on the principle of balancing the atmospheric pressure with the volume of mercury present in the device.

How does a mercury barometer work?

1. Also known as a Torricellian barometer, it consists of a container filled with mercury and a glass tube which has one end sealed.
2. The open end of the long and hollow vertical glass tube is positioned at the bottom inside the mercury container.
3. At sea level, with the increase in the air temperature, the mercury in the glass tube rises because the increase in a temperature pushes down on the mercury inside the container.
4. With the decrease in the air temperature, the mercury in the tube drops down due to the decrease in the pressure.
5. The working of the mercury barometer is affected by the increase in the altitude. At a higher altitude, the pressure falls with the increase in altitude.
6. The atmosphere at higher altitudes does not push down on the mercury in the container which does not result in the rising of mercury so far in the tube.
7. The positioned glass tube has measurements or markings on its side. The atmospheric pressure is recorded by reading it through the measurements on the tube.

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