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pressure of a co2 tank

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: frankrede » Mon Aug 27, 2007 6:16 am

TaBo wrote:Sorry dude, i just wake up.. (not excuse -_-)
yes, English is my second language.

what i try to say is that i don't know how to connect the CO2 soda-stream tank to steel chamber without to take the soda-stream machine connectoin.
i can't use any connection that in the fix measure because there is wired opening to the tank

and CO2 C-A-N N-O-T be liquid because CO2 molecules can't be to other CO2 molecule in way that they will be liquid, this is the model of the molecule, CO2 can be just gas or solid
You dare argue with us?
THIS IS MADNESS!

CO2 can become a liquid and by arguing otherwise you are setting your self up for epic fail.

CO2 DOES BECOME A LIQUID, that is at high enough pressures, just like propane.
Google Liquid CO2, I guarantee that you will find that what we are saying is true.
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Unread postAuthor: Marco321 » Mon Aug 27, 2007 6:20 am

frankrede wrote:
TaBo wrote:Sorry dude, i just wake up.. (not excuse -_-)
yes, English is my second language.

what i try to say is that i don't know how to connect the CO2 soda-stream tank to steel chamber without to take the soda-stream machine connectoin.
i can't use any connection that in the fix measure because there is wired opening to the tank

and CO2 C-A-N N-O-T be liquid because CO2 molecules can't be to other CO2 molecule in way that they will be liquid, this is the model of the molecule, CO2 can be just gas or solid
You dare argue with us?
THIS IS MADNESS!

CO2 can become a liquid and by arguing otherwise you are setting your self up for epic fail.

CO2 DOES BECOME A LIQUID, that is at high enough pressures, just like propane.
Google Liquid CO2, I guarantee that you will find that what we are saying is true.


There is truth to both of you. CO2 does whats called sublimes at standard pressure, it means it either is solid or gas, not a liquid. But, under certain pressure and temperature it becomes a liquid such as in CO2 canisters and such.

The sublimation can be demonstrated with dry ice (solid co2), it is either a solid or a gas, hence the name dry ice.
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Unread postAuthor: TaBo » Mon Aug 27, 2007 8:36 am

mm well, if you say, i belive you... but i'll need 2 more point's in my chemistry test lest year! :P
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Unread postAuthor: Orpackrat » Mon Aug 27, 2007 11:36 am

TaBo wrote:and guy's CO2 cant be liquid, CO2 when it freez becom to solid... dry-ice is CO2 that freezed



Like everyone else is saying, Co2 is a gas but under pressure it can be a liquid. If a paintball tank only had Co2 in it and no liquid, you might get 20 shots (20oz tank). The liquid Co2 inside tank turns to gas and replaces Co2 that was fired though the gun. With the liquid Co2 constantly replacing the fired gas you are able to get 1,000 shots instead of maby 20.

Actually, Dry-ice is compressed Liquid Co2. You could make it yourself with one of these and a bulk Co2 tank with siphon.

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http://www.hammacher.com/publish/74614.asp?source=Nextag&keyword=74614&cm_ven=NewGate&cm_cat=Nextag&cm_pla=HOME%20ESSENTIALS&cm_ite=74614#
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Unread postAuthor: DYI » Mon Aug 27, 2007 12:16 pm

This is the phase diagram for CO2.
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Unread postAuthor: darkmilk » Mon Aug 27, 2007 9:01 pm

co2 liqufies at about 800 psi depending on the temp, so untill the chamber over flows with liquid co2 it will not rais the psi and vis versa the psi will not drop untill the liquid co2 is depleted, same with propane, thats why if youve ever shaken a can of propane or co2 it feels liquidy

http://www.spudfiles.com/spudtech_archi ... php?t=6764

according to that a 1/2 by 6 inch chamber would be about 840 psi, assuming it was possible to empty the entire cartridge into it also it would be 800 psi with small amount of liquid co2


so i was right, right? i never took chemistry im only 16, im only going off what i think i know but im prety sure what i said was correct.
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Unread postAuthor: DYI » Tue Aug 28, 2007 10:59 am

Well, if the cartridge was at 800 psi, there is no possible way that dumping it into something with a larger volume could increase the pressure. As the volume of a given amount of gas increases, the pressure decreases. If the cartridges store CO2 as a liquid, then the pressure in your 1/2"x6" chamber should stay at 800 psi, since some of the liquid will evaporate into gas as you use the existing gas, keeping the pressure near the liquification point. This will continue until the point where all of the liquid CO2 is used.
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