When full, a gas cylinder registers a pressure of 2200 psig. After a few hours of use, the pressure gauge reads 550 psig. The cylinder is now how full?
a. One-half
b. One-third
c. One-fourth
d. Two-thirds
ANS: C
For gas-filled cylinders, the volume of gas in the cylinder is directly proportional to its pressure at a constant temperature. If a cylinder is full at 2200 psig, it will be half full when the pressure de-creases to 1100 psig.
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