A barometer reads 75 cm of mercury. When 2.0cm3 of air at atmospheric pressure is introduced into space above the mercury level, the volume of the space becomes 50cm3. The length by which the mercury column descends is
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.
If mercury is replaced with water in barometer, what would be the height of water column at standard atmospheric pressure, i.e., 76 cm of mercury? (Specific gravity of mercury =13.6)