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What is a liquid's critical point?
The point at which the liquid becomes a gas
The point at which a liquid turns solid.
The liquid's maximum temperature at which it can exist.
The highest pressure at which the liquid can exist as a liquid
Answers (1)
For correct option D
A liquid's critical point is the temperature and pressure at which the liquid and gas phases of a material become indistinguishable, at which point the substance is said to be in a supercritical condition.
Regardless of the pressure exerted, the material cannot exist as a liquid beyond the critical point.
At the critical point, the density of the liquid and gas phases becomes identical, and any additional rise in pressure or temperature causes the material to enter a supercritical form with unique features of both the liquid and gas phases.
The material can only exist as a gas above the critical temperature and pressure, and as a liquid below the critical temperature and pressure.
For correct option A
The boiling point or vaporisation point is the temperature at which a liquid turns into a gas.
It is the temperature at which a liquid's vapour pressure matches the pressure around the liquid, causing bubbles to develop throughout the liquid.
The vapour is released into the surrounding environment when the bubbles rise to the surface.
For correct option B
The freezing or solidification point is the temperature at which a liquid solidifies. It is the temperature at which a liquid changes to a solid due to thermal energy loss, forcing molecules to organise themselves into a set, hard form.
For correct option C
The critical temperature is the greatest temperature at which the liquid can exist. It is the temperature at which a gas cannot be liquefied regardless of pressure.
At this temperature, the vapour pressure of the material exceeds the critical pressure, and the substance enters a supercritical state, displaying both liquid and gas features.
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