Pressure Gauge
The gauge pressure in a helium gas cylinder is initially 28 . After many balloons have been blown up, the gaug?
The gauge pressure in a helium gas cylinder is initially 28atm . After many balloons have been blown up, the gauge pressure has decreased to 4atm.
What fraction of the original gas remains in the cylinder?
5/29.
The gauge pressure is the difference between absolute and atmospheric pressures. Thus the initial contents was 29 atm and the reduced contents is 5 atm.
The tricky part, of course, is getting that last 1 atm out of the cylinder. People generally don't try because it would mean pulling it out with a vacuum pump.
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