Associate Safety Professional Practice Exam

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What does the term 'critical pressure' refer to?

  1. The pressure required for water to boil

  2. The point where no liquid-vapor phase transition occurs

  3. The maximum pressure a container can withstand

  4. The pressure at which gas turns into a solid

The correct answer is: The point where no liquid-vapor phase transition occurs

The term 'critical pressure' refers to the specific pressure above which a substance cannot exist in a liquid state, regardless of its temperature. This point represents the conditions under which the liquid and vapor phases of a substance become indistinguishable, effectively eliminating any phase transition between them. At this state, known as the critical point, the substance is in a supercritical fluid state, exhibiting properties of both liquids and gases. Understanding critical pressure is crucial in various scientific and engineering fields, particularly in thermodynamics and chemical engineering, where control of phases can significantly impact system behavior and safety.

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