[填空题]
The gauge pressure in a helium gas cylind(gq2 el- w )tozcm27kzu 9vgsk/8(zs7e m 8wp5hqq) user is initially 28 atm. After many balloons have been blown up, the gauge pressure has decreased to 5 atm. What fraction ofg 7 vw9k5/su88 hpmus) sqq(ze the original gas remains in the cylinder?