Why does the boundary between

Question:

Why does the boundary between the liquid phase and gaseous phase disappear on heating a liquid to critical temperature in a closed vessel? In this situation what will be the state of the substance?

Solution:

The boundary between the liquid phase and gaseous phase disappear on heating a liquid up to critical temperature in a closed vessel because at the critical point the

densities of liquid and the vapour become equal. The fluid at this stage is called ‘supercritical fluid’

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