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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
| 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: |
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: |
Possible to maintain equilibrium mixture of all three phases. |
Posted March 13, 2015
Copyright: 1996 - 2026 |
About RF Cafe 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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived... |
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