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Pressure - Temperature (P-T, aka Phase State) Diagram

A common graphic used to illustrate the relationship of substances in their phase states as a function of pressure and temperature is the P-T diagram. It is also referred to as a phase state diagram or a phase change diagram. The asterisk in the P-T diagram below identifies a pressure-temperature combination that is known as the triple point, which is where the substance can simultaneously exist as a solid, a liquid, or a vapor.

 

P-T Diagram for a Substance That Expands On Freezing

 

Presure-Temperature (P-T, aka Phase) Diagram - RF Cafe
From To Phase Changes
Liquid Solid Fusion (aka Freezing)
Liquid Vapor Vaporization
Solid Vapor Sublimation
Solid Liquid Melting
Vapor Liquid Condensation
Vapor Solid Deposition
Critical Point Marker - RF Cafe Critical Point: Pure vapor phase has same properties as pure liquid phase at same temperature and pressure. It is the highest temperature at which a gas can be liquefied, regardless of pressure.
Triple Point Marker - RF Cafe Triple Point: Possible to maintain equilibrium mixture of all three phases.

 

 

 

 

Posted  March 13, 2015

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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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