Which value is closest to 150 psig among the propane vapour pressure values?

Which value is closest to 150 psig among the propane vapour pressure values?

• A. 138.4 psig
• B. 149.0 psig
• C. 172.0 psig
• D. 10.7 psig

Answer: (B)

Propane vapor pressure is the pressure at which the liquid propane is in equilibrium with its vapor at a given temperature. At typical room temperatures, this pressure is around 150 psig. To find the value closest to 150 psig, compare how far each option is from 150: 149.0 psig is only 1 psig away, while the others are noticeably farther (138.4 psig is about 11.6 away, 172.0 psig is about 22 away, and 10.7 psig is far off). Therefore, 149.0 psig is the best choice because it is the closest to 150 psig.

Propane vapor pressure is the pressure at which the liquid propane is in equilibrium with its vapor at a given temperature. At typical room temperatures, this pressure is around 150 psig. To find the value closest to 150 psig, compare how far each option is from 150: 149.0 psig is only 1 psig away, while the others are noticeably farther (138.4 psig is about 11.6 away, 172.0 psig is about 22 away, and 10.7 psig is far off). Therefore, 149.0 psig is the best choice because it is the closest to 150 psig.