Posted by: Sigrun on April 08, 2003 at 11:42:11

Without getting into complex physics and thermal dynamics just realize that what makes CO2 stay in a liquid state is a function of pressure and temprature. Changing the temprature will cause changes in the pressure so in a sense the pressure is regulated by temp. If this is to be complete then you should be able to change the pressure by changing the temp. This is correct and is verified by rapidly firing your gun. As you draw more CO2 out of the bottle you are reducing its pressure, the liquid CO2 can not stay a liquid and evaporates quickly thus cooling the bottle in the process. Once the temp and pressure level out the CO2 stops evaporating. Next, regulators are designed to work on gases. If you have a regulator on CO2 you not only draw gas but also some liquid. The regulator can not work correctly because once the liquid passes the regulator it will act according to the ambient tempreture and find its own pressure. If you put an expansion chamber before the reg, you might be able to see some benifit. But as a basic rule, use regs on HPA and expansion chambers on CO2. : Well im using co2, but some one told me you can't regulate co2, but ou cna regulate compressed air? i dont get it, i know co2 is a liquid, but they both have a pressure? woah

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