Posted by Jamie Young on July 28, 1999 at 11:50:29:
In Reply to: PROPANE TANK for air posted by Gary on July 28, 1999 at 06:33:37:
For an explanation see the following link from Scientific American
http://www.sciam.com/askexpert/physics/physics21.html
Please do not send me e-mails. I am mearly pointing to an answer provided by those whose knowledge in this area is greater than my own. That and in the 25 years since I took Chemistry and Physics in college, the only thing I seem able to remember is that an overpumped Beer keg results in nothing but foam.