A barometer tube is 80 cm long (above th...

A barometer tube is 80 cm long (above the mercury reservoir). It reads 76 cm in a particular day. A small amount of water is introduced in the tube and the reading drops to 75.4 cm. Find the relative humidity in the space above the mercury column if the saturation vapor pressure at the room temperature is 1.0cm.

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Atmospheric pressure = 76 cm of Hg
When water is introduced the water
vapour exerts some pressure which
counter acts at the atmospheric pressure
The pressure drops to 75.4 cm
Pressure of vapour
= ( 76-75.4) cm `
= 0.6 cm
Relative Humidity
` =VP/SVP = 0.6cm/ 1cm = 60%` .

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