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Byju's Answer

Standard XII

Chemistry

Introduction to Chemistry

What is the e...

Question

What is the effect of rise in temperature on the density of mercury in a barometer and hence its reading?

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Solution

Since increase in temperature leads to decrease in density . Now in thermometer, same mass will occupy more volume due to increase in temperature. So it will raise the level in thermometer and it will record increases in reading.

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A barometer tube is 80 cm long (above the mercury reservoir). It reads 76 cm on 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 vapour pressure at the room temperature is 1.0 cm.

A faulty barometer contains certain amount of air and saturated water vapour. It reads 74.0 cm when the atmospheric pressure is 76.0 cm of mercury and reads 72.10 cm when the atmospheric pressure is 74.0 cm of mercury. Saturation vapour pressure at the air temperature = 1.0 cm of mercury. Find the length of the barometer tube above the mercury level in the reservoir.

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