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Objective:To study the relationship between the dry-bulb and wet-bulb temperatures of air andits humidity.To determine the flow rate of air through the apparatus by using an orifice plate and amanometer the following equation is used:21air21c212122dPPg2AA1A=QAbsolute humidity is the amount of water present in a specific amount of air. It isdefined as the mass (lb or kg) of water vapour per mass (lb or kg) of bone-dry air (bda). Bone-dry air is a carrier gas with no condensable vapour present.Relative humidity is the ratio of the actual water vapour pressure in the air to the water vapourpressure in saturated air at the same temperature.In this experiment, the concept of dry-bulb and wet-bulb psychrometer is used.In asimple wet and dry-bulb psychrometer, there are two identical thermometers (thermocouplesin this experiment). One bare (dry-bulb thermometer) gives the dry-bulb temperature (