Re: PV = T

dive-instructors.com, the first place to look for a dive instructor

[ Follow Ups ] [ Post Followup ] [ California Scuba Diving BBS ] [ FAQ ]

Posted by Chuck Tribolet on February 23, 2007 at 15:32:28:

In Reply to: PV = T posted by ptf on February 23, 2007 at 11:01:32:

It's not the cylinder that gets warm, it's the gas. The gas in
the banks is at 4000 PSI. The tank will be at 3000 PSI when done.
If we instantaneously transfer the gas, and it's at 68F (20C, 293.15K) in the banks, it will be at (3000/4000)*293.15K = 219.8652K
= -63.91F. COLD.

Now, we don't transfer the gas instantly, it warms up a bit going
through the lines and by absorbing heat from the tank, but I'll bet
the tank is colder than ambient in the 30 second fill case.


Follow Ups:

Optional Link URL:
Optional Link Title:
Optional Image URL:
Post Background Color: White     Black
Post Area Page Width: Normal   Full
You must type in the
scrambled text key to
the right.
This is required to
help prevent spam bots
from flooding this BBS.
Text Key: