The liquefaction of carbon dioxide is shown. In Part 3, the pressure in the tube continues to rise until the valve is opened, at which point the pressure drops and the liquid changes to solid.
Dry ice is placed into an acrylic plastic cylinder. A valve is closed and pressure in the cylinder increases. When the pressure reaches 350 kPa (50 psi) it stops increasing and liquid CO2 appears. The liquid begins to boil and when all solid CO2 is gone, the pressure increases further. The valve is opened and the pressure drops again, holding constant for a while at 350 kPa. Eventually solid CO2 reforms, the liquid disappears, and the pressure drops completely. An animation of this process superimposed on a phase diagram follows.
Credits:
- Design, Demonstration and Production
- John W. Moore University of Wisconsin - Madison, Madison, WI 53706
- Lynn R. Hunsberger University of Louisville, Louisville, KY 40292
- Steven D. Gammon University of Idaho, Moscow, ID 83843
- Text
- Kelly Houston Jetzer University of Wisconsin - Madison, Madison, WI 53706
- John W. Moore University of Wisconsin - Madison, Madison, WI 53706