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In barometer, the given space labelled as A, above the mercury is

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in Chemical Process Calculation by (98.8k points)
In barometer, the given space labelled as A, above the mercury is

(a) Vacuum

(b) Filled with Air

(c) Filled with water

(d) Filled with Gas

The question was posed to me in semester exam.

My enquiry is from Pressure and Hydrostatic Head-I in division Introductory Concepts of Chemical Process Calculation

1 Answer

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Best answer
Right choice is (a) Vacuum

The explanation is: To correctly measure the atmospheric pressure, the space above the mercury level in a barometer is essentially vacuum. Otherwise, the fluid in the space will exert a pressure on the mercury surface.

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