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At the critical point of a substance

This question belongs to Chemical Engineering Chemical Engineering Thermodynamics
Chemical Engineering Thermodynamics
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At the critical point of a substance

Answer & Solution
Correct Answer: Option D
A critical point is a point where the physical distinction between the liquid and vapor vanishes since there will be no further difference in properties like surface tension, volume, density etc. Between the liquid and vapor. So we call the state of substance at and above the critical point as gas.
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