Find wet bulb temperature using this psychrometric chart. Pleaseshow how you find it.

Given: Temperature (dry bulb) 75.7 deg F, Relative Humidity31.5%, Dew Point 48.5 deg F

.028 .024 .020 .016 .012 ENTHALPY, BTU PER POUND DRY AIR 80% (60%) Ct 40% 20% 50 + 80 40 50 60 70 80 DRY BULB TEMP, F 12.5 13.0 13.5 Fig 602-3. Normal temperature psychrometric chart. 14,5 15.0 90 100 110 120 90 100 14.0 SPECIFIC VOLUME, CU FT/LB DRY AIR 1110 14.5 .028 .024 .020 \.016 15.0 .012 .008 .004 0 HUMIDITY RATIO, POUNDS MOISTURE PER POUND DRY AIR