- #1
LunaFly
- 35
- 7
Hi all,
I am wondering about where the vapor pressure curve would be located on the PVT surface of a substance.
I know that as the temperature of a liquid increases, its vapor pressure increases. This continues until the vapor pressure is equal to the atmospheric pressure, at which point the substance begins to boil and goes through a phase transition.
What I am wondering is what kind of path does the vapor curve make on the PVT surface? I am using a closed flask being heated as an example. I would think that it would begin somewhere in the liquid region of the surface. Then as the temperature increases, the volume would decrease slightly as the water evaporates and the vapor pressure increases. Once the liquid reaches boiling point and the liquid-vapor region of the diagram, the volume would immediately increase (as vapor is now included as a part of the volume) then remain constant (as the size of the flask is constant). During this time the pressure would continue to increase until all of the liquid had turned into vapor.
I am very unsure if this is really how the vapor pressure curve would appear on the PVT surface or not. I am also curious as to how it would change if the flask was a different size but with the same amount of liquid initially. Any input would be much appreciated! Thanks.
-Luna
I am wondering about where the vapor pressure curve would be located on the PVT surface of a substance.
I know that as the temperature of a liquid increases, its vapor pressure increases. This continues until the vapor pressure is equal to the atmospheric pressure, at which point the substance begins to boil and goes through a phase transition.
What I am wondering is what kind of path does the vapor curve make on the PVT surface? I am using a closed flask being heated as an example. I would think that it would begin somewhere in the liquid region of the surface. Then as the temperature increases, the volume would decrease slightly as the water evaporates and the vapor pressure increases. Once the liquid reaches boiling point and the liquid-vapor region of the diagram, the volume would immediately increase (as vapor is now included as a part of the volume) then remain constant (as the size of the flask is constant). During this time the pressure would continue to increase until all of the liquid had turned into vapor.
I am very unsure if this is really how the vapor pressure curve would appear on the PVT surface or not. I am also curious as to how it would change if the flask was a different size but with the same amount of liquid initially. Any input would be much appreciated! Thanks.
-Luna