Air at 300 K and 200 kPa is throttled by a valve to a pressure of 100 kPa. If the valve is adiabatic and the change in kinetic energy is negligible, the temperature of air after throttling will be

Question

Quizplus · Accepted Answer

Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen. 
"The temperature of an ideal gas remains constant during throttling, and thus"
T1=300 "K"
P1=200 "kPa"
P2=100 "kPa"
T2=T1 "K"
"Some Wrong Solutions with Common Mistakes:"
W1_T2=T1*P1/P2 "Assuming v=constant"
W2_T2=T1*P2/P1 "Assuming v=constant and pressures backwards"

Air at 300 K and 200 KPa Is Throttled by a Valve