Saturation line for a given substance

In summary: But in this context, and in the context of the book it is coming from, the saturation line is the line in the P-T diagram where the substance is a single phase, and that phase is a vapor.In summary, the saturation line for a given substance is the combination of temperature and pressure where 100% vapor exists. This line separates the region where there is a mixture of vapor and liquid from the region where only the liquid phase exists. The terminology for this line may vary, but it is commonly referred to as the saturation line or saturated vapor line.
  • #1
mech-eng
828
13
"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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  • #2
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.
 
  • #3
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.
 
  • #4
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!
 

Related to Saturation line for a given substance

1. What is the saturation line for a given substance?

The saturation line for a given substance is a line on a phase diagram that represents the conditions (temperature and pressure) at which the substance exists in equilibrium between its liquid and gas phases. This means that at any point on the saturation line, the substance will be in a state where both its liquid and gas phases are present in equal amounts.

2. How is the saturation line determined?

The saturation line is determined through experimental measurements and calculations based on the properties of the substance, such as its critical temperature and pressure. It can also be plotted on a phase diagram using data from empirical equations or thermodynamic models.

3. What is the significance of the saturation line?

The saturation line is significant because it represents the conditions at which a substance undergoes a phase change between its liquid and gas phases. It is also used to determine the critical point, which is the maximum temperature and pressure at which the substance can exist as a liquid and gas in equilibrium.

4. Can the saturation line be different for different substances?

Yes, the saturation line can be different for different substances because it depends on the properties of the substance, such as its boiling point, critical temperature, and critical pressure. Each substance will have its own unique saturation line on a phase diagram.

5. How does the saturation line relate to other lines on a phase diagram?

The saturation line intersects with other lines on a phase diagram, such as the vapor pressure curve and the liquid-vapor coexistence curve. It is also used to determine the boundaries between different phases of a substance, such as the liquid-vapor boundary and the liquid-solid boundary.

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