Critical Point of CO₂ (4C50.10)

Description:

liquid CO2 in a glass tube at high pressure is close enough to the critical point that warm air from a hair dryer will complete the transition. The tube is displayed with a video camera and the meniscus is seen, but when the tube is heated the meniscus slowly fades and disappears as the liquid CO2 goes through a gradual transition to a high pressure gas. A turbulent mixture of liquid and gas with equal densities is seen above and below the miniscus point.

Procedure or Operation Notes:

Turn on the flashlight and turn off the room lights. Use the hair dryer to gently heat the tube of Carbon Dioxide.

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References, Comments, or Footnotes:

1) See also PVT Surface Model for Carbon Dioxide (4C10.10).