What is the #"critical point"# of a given substance?

Answer 1

Just to expand on the previous answer.............

The critical point is the conditions of temperature and pressure where the densities of the condensed (the liquid phase), and the gaseous phase, become equal, and one can no longer differentiate between the 2 phases.

On the graph, the critical point occurs under high pressure regimes.

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Answer 2

Mateo Aguilar

The critical point of a substance is the specific combination of temperature and pressure at which distinct liquid and gas phases cease to exist, and the substance displays unique properties.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.