Properties of Saturated Water Question
Properties of Saturated Water Question
(OP)
This is my first post on this site. I had a question about saturated water properties. If you know the temperature of water and you are looking at a table of properties. What does it mean if your pressure is above the saturation pressure. Does that mean it is super heated vapor or incompressible liquid? I never could get a grasp on that.





RE: Properties of Saturated Water Question
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Properties of Saturated Water Question
RE: Properties of Saturated Water Question
Looking at a phase diagram one can see that even at 27oC (~300 K) liquid water can be transformed into a solid (type 6 ice) at a pressure of 109 Pa.
RE: Properties of Saturated Water Question
In addition, from the same diagram, one sees that vapor at 400 K, can be condensed at ~106 Pa, and the liquid can be solidified, at the same temperature, at a pressure of 1010 Pa, to type VII ice.
RE: Properties of Saturated Water Question
RE: Properties of Saturated Water Question
If I'm not mistaken your term "mixture" refers to the presence of more than one stable phase.
The lines on a P/T phase diagram represent equilibrium between coexisiting phases. As long as you stay on the lines, by changing T and P as needed, the phases will continue appearing.
Assuming these lines are neither vertical nor horizontal, changing only one parameter, may move the system away from equilibrium into a single phase zone.
I suggest to have a look at the phase rule (in wikipedia or any general chemistry text).
RE: Properties of Saturated Water Question
Further to atotiace's post on 7 October:
If the pressure is below the saturation pressure then the substance is superheated vapour.
Only when the pressure corresponds exactly to the saturation temperature is it possible for there to be a mixture of liquid and vapour.