Temperature-Entropy Diagram for Water

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This Demonstration shows a temperature-entropy () diagram for water. Use the checkboxes to add or remove a property from the diagram. You can show lines of constant enthalpy (green), pressure (blue) and quality (mass% vapor, purple). Check "phase envelope" to view the saturated liquid (magenta) and saturated vapor (orange) curves and the location of the critical point. Check "grid lines" to display grid lines.

Contributed by: Adam J. Johnston (August 2016)
Additional contributions by: Rachael L. Baumann and John L. Falconer
(University of Colorado Boulder, Department of Chemical and Biological Engineering)
Open content licensed under CC BY-NC-SA



See [2] for more information on how to read a diagram.


[1] "Thermophysical Properties of Fluid Systems." (Aug 11, 2016) webbook.nist.gov/chemistry/fluid.

[2] T-S and P-H Diagrams [Video]. (Aug 11, 2016) www.youtube.com/watch?v=10q0akdZ7QQ.

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