Here we can see the seperate phases of carbon dioxide. The meniscus is easily observed.
With an increase in temperature the meniscus begins to diminish.
Increasing the temperature further causes the gas and liquid densities to become more similar. The meniscus is less easily observed but still evident.
Once the critical temperature and pressure have been reached the two distinct phases of liquid and gas are no longer visible. The meniscus can no longer be seen. One homogenous phase called the "supercritical fluid" phase occurs which shows properties of both liquids and gases.

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