Law of partial pressures

[pmorrissette (Phil_M)]

Venting a keg doesn’t fit the “ideal gas” ideal at all, hence why the partial gas law doesn’t make much difference.

My physics is rusty, I’ll admit. I work with electronics, not gases.

[hopfenundmalz]

Because the partial pressure stuff really only applies to diffusion. Gases mix and behave as a single solution in a situation like purging a keg. Partial pressure forces are tiny compared to the energy of releasing a valve.

This is very true. Diffusion due to partial pressure may take hours. It can cause O2 to get under a bottle cap through the liner, given enough time. When we purge the keg, it all flows out.

[jonhughey_att.net (HoosierBrew)]

@hopfenundmalz

Because the partial pressure stuff really only applies to diffusion. Gases mix and behave as a single solution in a situation like purging a keg. Partial pressure forces are tiny compared to the energy of releasing a valve.

This is very true. Diffusion due to partial pressure may take hours. It can cause O2 to get under a bottle cap through the liner, given enough time. When we purge the keg, it all flows out.

My thoughts, too.