The following is a video provided to me by Dr. Christopher
Rayner of the University of Leeds. The video shows carbon dioxide
in a high pressure vessel. The video is being obtained through a
circular window in the vessel (there is also a window on the opposite
side of the vessel which appears as a circle in the center of the
frame) and shows an initial mixture of liquid and gas phase carbon
dioxide. The meniscus is apparent. The temperature in the vessel is
being increased. As time passes the system is getting closer and
closer to the critical temperature. Eventually the critical
temperature is exceeded and you can see the meniscus become blurry and
then disappear. Enjoy!
Click here for video