Saturation line for a given substance

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SUMMARY

The saturation line for a given substance represents the specific temperature and pressure conditions where 100% vapor exists. Below this line, a mixture of vapor and liquid is present until the saturated liquid line is reached, indicating only the liquid phase. The discussion highlights the potential confusion surrounding the terms "saturation line," "saturated liquid line," and "saturated vapor line," emphasizing the need for clarity in thermodynamic terminology. It also notes the differences in terminology usage between physics and engineering contexts.

PREREQUISITES
  • Understanding of thermodynamic principles, specifically phase changes.
  • Familiarity with the concepts of saturation lines in thermodynamics.
  • Knowledge of temperature and pressure relationships in phase diagrams.
  • Basic comprehension of vapor-liquid equilibrium.
NEXT STEPS
  • Research the definitions and applications of saturation lines in thermodynamics.
  • Study phase diagrams and their interpretation for various substances.
  • Learn about vapor-liquid equilibrium and its significance in engineering.
  • Explore the differences in terminology between physics and engineering in thermodynamics.
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Students and professionals in engineering, particularly those specializing in thermodynamics, as well as anyone involved in the study of phase changes and vapor-liquid equilibrium.

mech-eng
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"The saturation line for a given substance is the combination of temperature and pressure where 100% vapor exists. At any point below this line, there will be a mixture of vapor and liquid, until a point is reached when only the liquid phase exists."

I don't understand above passage from @SteamKing's post. Is saturation line= saturated liquid line + saturated vapor line, as in the picture?

If you have a mixture, can you use a saturated liquid table?

upload_2017-4-24_17-29-23.jpeg


Source: Introduction to Engineering Thermodynamics by Sonntag/Borgnakke.

Thank you.
 
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Here is a "translation":
mech-eng said:
"The saturation line [= saturated-vapor line] for a given substance is the combination of temperature and pressure where 100% vapor exists. At any point below this line, there will be a mixture of vapor and liquid, until a point [= saturated-liquid line] is reached when only the liquid phase exists."
Edit: Note also that @SteamKing was talking about T and P, while the picture you posted is T vs V.
 
DrClaude said:
Here is a "translation":

But thermodynamics is an relatively old science but in the thread there is confussion on the names of concepts. Would you please share the common terms. Of course they cannot be only one for the same concept.

Saturation Line or Saturated Vapor Line.

Saturation line might be confused with if it is for liquid or vapor.
Thank you.
 
mech-eng said:
But thermodynamics is an relatively old science but in the thread there is confussion on the names of concepts.
SteamKing may have been talking colloquially. In any case, the terminology is often far from fixed, especially between physics and engineering. I stopped counting the number of times confusion arises at PF due to the different definitions of an ideal gas!
 

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