C02 capsules contain LIQUID CO2?

[The_Mentalist]

Hi I read everyone saying that the capsules (12g) contain liquid CO2 but when you shake them, even when half empty you can't hear any liquid "sloshing" about inside. I have found the same with CO2 fire extinguishers which everyone says contains liquid. Is it a common misconception that they contain liquid or is the liquid existing at some kind of double phase (half way between liquid and gas similar to it's triple point)?
I know the question is a bit "sciency" but I thought someone here would know and its been bugging me for a while.

[WebleyCrosman]

Liquid is CO2 at approximately 58 Bars of pressure.
The pressure increases with temperature, which is why the speed of the pellets changes with temperature.

Under normal atmoshperic pressure, obviously the CO2 exists as a gas.

In order to liquify it, you have to pressurise to about 58 Bars.

In order to get sloshing there has to be a gas above a liquid.

The CO2 under pressure can not exist as gas because the pressure is too high.
Instead it exists a liquid/gas state.
So the liquid/gas expands to fill the volume inside the capsule.

The CO2 remains in this state until the volume of CO2 drops to 30% of the original mass of gas.

This is when the power drops from shot to shot.

If you keep the ambient temperature the same, then the CO2 will produce exactly the same power from every shot, until you have used 70% of the mass of the CO2.

If you keep the temp constant and wait for CO2 gas to return to the ambient temperature between each shot, then you will have get very close pellet speeds from shot to shot.

Obviously this depends on the airgun you are using too.

My heavily modded Crosman 2240 was so consistant, the fps deviation averages out to about plus or minus 1/2 of a FPS.

[The_Mentalist]

Hi Thanks for clearing that up for me in my head. I do have another question though. If you were to have a tank of CO2 standing upright and you were to connect it to another empty tank, would the empty tank fill up with liquid/gas seeing as the only a double phase is present or would it fill up with just gas (boiling off the liquid phase in the first tank)?
Thanks again

[WebleyCrosman]

The CO2 under pressure in the tank is a liquid/gas and remain liquid/gas at 56 BARS of pressure, until you use 70% of the CO2 in the tank that you are filling FROM.

After that point, all the pressure in the world can't liquify it.

So it changes to a gas.

http://library.tedankara.k12.tr/chem...anges/z128.htm

This above link the phase diagram for CO2.

So it show which phase gas, liquid or solid the CO2 exists at a given pressure and temperature.

An atmoshpere of pressure is the same as 1 Bar.

[The_Mentalist]

Ok yea I understand thanks for your input on that its been bugging me for ages lol

[cptman]

what the hell are you two going on about?