- #1
RandyP
- 3
- 0
Hello Everyone,
I have a question regarding the diffusion of a gas (or mixture of gases) into an evacuated space. The situation I am picturing is one where you have two vessels of equal volume, one contains a gas at room temperature, some known pressure (say ~760torr), and the other at static high vacuum (say ~1e-5 torr). Joining the vessels is a length of tubing with a valve at the center.
Upon opening the valve, obviously the gas will diffuse from the pressurized side to the evacuated side until an equilibrium is reached. My real question is how can I make a good approximation of how quickly that will occur? I realize it will be dependent on:
differential pressure
length of tubing
diameter of tubing
identity of the gas/gas mixture
...and probably some other factors I am not considering at the moment. Can anyone provide some insight for a rough determination?
Thanks much,
Randy
I have a question regarding the diffusion of a gas (or mixture of gases) into an evacuated space. The situation I am picturing is one where you have two vessels of equal volume, one contains a gas at room temperature, some known pressure (say ~760torr), and the other at static high vacuum (say ~1e-5 torr). Joining the vessels is a length of tubing with a valve at the center.
Upon opening the valve, obviously the gas will diffuse from the pressurized side to the evacuated side until an equilibrium is reached. My real question is how can I make a good approximation of how quickly that will occur? I realize it will be dependent on:
differential pressure
length of tubing
diameter of tubing
identity of the gas/gas mixture
...and probably some other factors I am not considering at the moment. Can anyone provide some insight for a rough determination?
Thanks much,
Randy