Hello; I'm new here and this is my first post. I think I've done all

that I can do before posting this: I've spend a lot of time searching

for the answer myself seaching archives in other physics forums, and

through Google, Google-Groups (specifically searching both sci.physics

and alt.sci.physics) with this search:

containing all the words: formula gas liquid dissol* pressure temp*

containing the specific phrase: surface area

.... and I've not been able to find an answer, so I hope someone here

will be kind enough to help.

I'm looking for a formula (and/or graphs or charts) to enable me to

predict how much time it will take for a certain level of gas to

dissolve into a soluable liquid based on the following variables:

1. Time

2. Pressure

3. Partial Pressure

4. Volume of Liquid (and of gas, if necessary)

5. Surface Area of liquid exposed to pressurized gas

6. Specific Gravity (if that makes a difference)

Now, my specific concern is to determine how long to apply pressurized

CO2 to 'force-carbonate' beer in a brewpub or microbrewery we are

considering. I have charts which tell me, for example, that to reach my

target carbonation level of 2.5 volumes (atmospheres) of CO2 at 32F,

then I need 8.2 psi pressure, but they don't explain how long it will

take. I know that carbonation will occur quicker with increased

pressure, and that surface area where gas and liquid are in contact is a

factor, too. I would like a formula that could tell me, for instance,

how long it would take to reach 2.5 volumes if I apply 30 psi at

32degreesF in a 10 barrel tank (310 gallons) with a surface area of

1,018 square inches; I don't want to pass my target volumes by very much

because then I would need to spend more time outgassing to get the level

back down, wasting CO2 in the process.

Thanks for any help anyone can provide.

Cheers.

Bill Velek