Hi folks!

a problem for everyone.

An oxygen cylinder of 7 m^{3}volume has initial gas pressure is 150 kg/cm^{2}as read on the gauge. Its nozzle has radius of 1 cm diameter. If nozzle is opened, how long will it take to reach to pressure of 4 kg/cm^{2}?

Assume Temp and density of gas to be constant.

Beginning of the thread:

Assumptions may not be correct. Density will decrease when gas is released. Temp can also fall if adiabatic sudden expansion. However, one can assume temp to be constant for slow release of the gas.

Now one has to derive the relation between P_{initial}, P_{final }and time. Go ahead. Start the thread.

Vishwa.