Shaking a liquid with gas dissolved in it will raise pressure (you can try this with soda). However, I think your question is not well-posed, as volatile means "1: readily vaporizable at a relatively low temperature" (see http://www.merriam-webster.com/dictionary/volatile), so "volatile gas" is an oxymoron. Almost invariably, a given mass of liquid will require less volume than the same mass of the same substance in gaseous phase, so condensation (the change in phase from gas to liquid) will tend to reduce pressure.

Information about American English usage here and here. Floating point issues? Please read this before posting. — emc

In reply to Re: OT: Physical exitation of pressurised liquid gas. by swampyankee
in thread OT: Physical exitation of pressurised liquid gas. by BrowserUk

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