Liquefaction of Carbon Dioxide - 1 of 4
Ordinarily carbon dioxide or dry ice sublimes, that is it passes directly from the solid to the vapor form. But under high pressure conditions, carbon dioxide can be caused to liquefy. Here some dry ice is placed into a strong plastic tube and a pressure gauge is screwed onto the top of the tube. A valve on one side of the gauge is open at the beginning, so the pressure inside the tube is the same as the atmospheric pressure outside.
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