A room contains air at 25°C and a total pressure of 87.0 kPa with a relative humidity of 85%. The partial pressure of dry air is

Question

Quizplus · Accepted Answer

Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
T1=25 "C"
P=87 "kPa"
RH=0.85
P_g=PRESSURE(Steam_IAPWS,T=T1,x=0)
RH=P_v/P_g
P_air=P-P_v
 
"Some Wrong Solutions with Common Mistakes:"
W1_Pair=P_v "Using Pv as P_air"
W2_Pair=P-P_g "Using wrong relation"
W3_Pair=RH*P "Using wrong relation"

A Room Contains Air at 25°C and a Total Pressure