Awet-bulb thermometer consists of a mercury-in-glass thermometer covered with a wetted (water) fabric. when suspended in a stream of air, the steady-state thermometer reading indicates the wet-bulb temperature . obtain an expression for determining the relative humidity of the air from knowledge of the air temperature ( [infinity] ), the wet-bulb temperature, and appropriate air and water vapor properties. if [infinity] 315 k and 300 k, what is the relative humidity of the airstream?