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Questions and Answers
What designates the conditions under which a liquid and its vapor can coexist?
What designates the conditions under which a liquid and its vapor can coexist?
- Liquid–vapor critical point (correct)
- Superheated point
- Triple point
- Critical temperature point
What is a critical point in thermodynamics?
What is a critical point in thermodynamics?
- A point where pressure and temperature have no effect on the phases
- A point where the substance becomes supercritical
- The end point of a phase equilibrium curve (correct)
- A point where all three phases (solid, liquid, vapor) coexist
What happens at the critical point in terms of phase boundaries?
What happens at the critical point in terms of phase boundaries?
- New phase boundaries form
- Phase boundaries become steeper
- Phase boundaries vanish (correct)
- Phase boundaries shift to higher temperatures
What are the defining parameters of a critical point?
What are the defining parameters of a critical point?
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Where does the liquid–vapor boundary terminate in the P-T diagram?
Where does the liquid–vapor boundary terminate in the P-T diagram?
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What is a thermodynamic system?
What is a thermodynamic system?
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What is the surrounding in a thermodynamic system?
What is the surrounding in a thermodynamic system?
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When does a system undergo a thermodynamic process?
When does a system undergo a thermodynamic process?
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What is a thermodynamic cycle?
What is a thermodynamic cycle?
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Study Notes
Thermodynamic Concepts
- The equilibrium phase coexistence of a liquid and its vapor is designated by the vapor-liquid curve.
Critical Point
- A critical point in thermodynamics is the point at which the distinction between the liquid and vapor phases disappears.
- At the critical point, the phase boundaries of a liquid and its vapor merge, and the distinction between the two phases disappears.
- The defining parameters of a critical point are the critical temperature (Tc) and critical pressure (Pc).
P-T Diagram
- The liquid-vapor boundary terminates at the critical point in the P-T diagram.
Thermodynamic System
- A thermodynamic system is a region in space where a set of thermodynamic processes can occur.
- The surrounding in a thermodynamic system is everything outside the system that can interact with it.
Thermodynamic Process
- A system undergoes a thermodynamic process when there is a change in its internal energy, temperature, or state.
Thermodynamic Cycle
- A thermodynamic cycle is a series of thermodynamic processes that return the system to its initial state.
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