Question

Problem 7.7: On a humid day in the central or southeastern Unitod States, one sometimes hears the casual comment that "it is 90 degrees (Fahrenheit) and 90% humidity." What dewpoint (in °F) would this combination represent? Note: Even in Houston, one of the muggiest cities in North America, dewpoints rarely exceed 82°F.

Answer 1

Ausl At 9 ° F the saturation rapour pressure of air=48-1x 103 bar = 48-1 X163 x 10 pa res=4.81 x 108 Pa and Relative humidity is given as- -R H= mixing ratio ix. 100 uro Saturation pressure - .. 90% = r xloo 925 r=00g xe- 0-9x4081x 10 pa. r=4•329 or ee=43-29x10 3 bar. therefore the dewpoint is that temperature at which the given mixing ratio becomes : equal to the saturation vapour pressure. o we have to look for temperature valine from google at which the air Satierates with given mixing ratio a cinci ore de 2.43-29 x 10 bar. o Dew point is to = 86.7 Ft from, I google