Comment by ycui1986
3 days ago
i think it had something to do with CO2 can be made into supercritical state relatively easily, not for nitrogen or other common gases.
3 days ago
i think it had something to do with CO2 can be made into supercritical state relatively easily, not for nitrogen or other common gases.
This pretty much
You can liquefy CO2 at a higher temperature than N2
You can do it easily with something like propane, or other larger molecules. But CO2 is non-flammable, largely non-toxic, and easily available.