A cylinder of N2O has a gauge pressure of 750 psig when full. What will be the pressure in this cylinder when it is half full?
a. 375 psig
b. 750 psig
c. 1500 psig
d. 2200 psig
ANS: B
Figure 40-6 compares the behavior of compressed gas and liquid gas cylinders during use. The vapor pressure of liquid gas cylinders varies with the temperature of the contents. For example, the pressure in a nitrous oxide cylinder at 70° F is 745 psig; at 60° F, the pressure decreases to 660 psig. As the temperature increases toward the critical point, more liquid vaporizes, and the cylinder pressure increases.
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