A glass contains some water at room temperature `20^(@)C`.Refrigerated water is added to it slowly. When the tempareture of the glass reaches `10^(@)C,`small droplets condense on the outer surface. Calculate the relative humidity in the room. The boling point of water at a jprjjessure of 17.5mm of mercury is `20^(@)C`and at 8.9mm of mercury is `10^(@)C`.