An HVAC&R operator measured the dry- and wet-bulb temperatures in an air
conditioned space as 75°F (23.9°C) and 63°F (17.2°C), respectively. Find the relative humidity
of this air conditioned space by using ASHRAE’s chart and by calculation. The humidity ratios
of the saturated air at temperatures of 75 and 63°F are 0.018809 and 0.012355 lb/lb (kg/ kg),
respectively