Liquefaction of Carbon Dioxide - 2 of 4
When the valve is closed, the pressure in the tube begins to build up. The pressure rises steadily until the gauge reads about 350 kilopascals.
At this point the pressure stops increasing and the dry ice in the tube begins to melt and form liquid at the very bottom of the tube. There is also some gas being given off from the liquid and the liquid appears to be boiling. Once most of the solid is gone, the pressure begins to rise again on the pressure gauge. To review: the pressure rises until there is an equilibrium between solid, liquid, and gaseous carbon dioxide, and then it holds steady.
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