434. The dry-bulb temperature is 78°F (26°C) and the wet-bulb temperature is 68°F (20°C). What is the relative humidity?

The psychrometric chart indicates a relative humidity of 60% when the dry-bulb temperature is 78F and the wet-bulb temperature is 68F. This is determined by finding the intersection of the corresponding dry-bulb and wet-bulb lines on the chart and reading the associated relative humidity value.