A barometer reads 75cm if mercury. When `2.0cm^(3)` of air at atmospheric pressure is introduced into space above the mercury level, the volume of this space cecones `50 cm^(3)`. find the length by which the mercury column desecds.

A barometer reads 75cm if mercury. When `2.0cm^(3)` of air at atmosphe

1.	A barometer reads 75cm if mercury. When `2.0cm^(3)` of air at atmospheric pressure is introduced into space above the mercury level, the volume of this space cecones `50 cm^(3)`. find the length by which the mercury column desecds.
Answer» Let the pressure of the air in the barometer be p. We have , `pxx50cm^(3)=(75cm of mercury)xx(2.0cm^(3))` `p=3.0cm` of murcury. The atmospheric pressure is equal to the pressure due to the mercury column plus the pressure due to the air inside, Thus, the mercury column descends by `3.0cm`.

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A barometer reads 75cm if mercury. When `2.0cm^(3)` of air at atmospheric pressure is introduced into space above the mercury level, the volume of this space cecones `50 cm^(3)`. find the length by which the mercury column desecds.

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