Question

Explain the construction and working of barometer with a diagram.​

Answer 1

Answer:

Explanation:

The barometer is a device used to measure atmospheric pressure. It consists of a tall glass tube inverted in a bath of mercury. Please refer to the attached picture for construction.

The liquid will rise up partially in the tube, similar to a thermometer. We use mercury in barometers as it is denser than water. If we use water, we might need a very tall tube, rendering the barometer enormous and impractical.

Answer 2

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$\bold\orange{Barometer -}$A barometer is an instrument that is used to measure pressure. It is generally used to measure atmospheric pressure.

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A mercury barometer has a glass tube with a height of at least 84 cm , closed at one end, with an open mercury-filled reservoir at the base. The weight of the mercury creates a vacuum in the top of the tube. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir.

The pressure is quoted as the level of the mercury's height in the vertical column.One atmosphere (1 atm) is equivalent to 760 millimeters of mercury column. So the height of the mercury column varies according to external pressure on the mercury in reservoir.

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There are two columns. one is to measure atmospheric pressure and another one has a mercury column. As much pressure the air exerts on one column, equal pressure has to be exerted through other column of mercury.

( refer the attachment )