[leijggeds]

I'm going highschool physics at the moment, and I have to do a project on relating to CO2 pressure.

Here's the information I know:
-is a gas above -78 celcius
-is a liquid when pressurized (amount not known)

Wikipedia:
At temperatures below −78 °C, carbon dioxide changes directly from a gas to a white solid called dry ice through a process called deposition. Liquid carbon dioxide forms only at pressures above 5.1 atm; at atmospheric pressure, it passes directly between the solid phase and the gaseous phase in a process called sublimation. A lot of sites I see are pretty damn useless with information on CO2, but this is what I need if someone is kind enough to help.

1) Temperature vs Pressure in a 9oz (0.266 liter) tank.
2) Pressure vs Volume (5.1 atm =
3) How to calculate what percentage is liquid in a 9oz tank.


Also, SI units would be best if possible.

Thanks!