Phase diagram of water © Siemens Stiftung 2016 CC BY-SA 4.0 international

Phase diagram of water

Image

Diagram:
A P-T diagram for pure water. The lines indicate the temperature and the pressure at which the solid, liquid, and vapor phases exist in equilibrium. All three phases exist in equilibrium only at the triple point; otherwise, there are a maximum of two phases.

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2016-12-08
In addition to the equilibrium curves (melting pressure curve, sublimation curve, vapor pressure curve), the diagram also includes the pressure and temperature data for the melting, boiling, triple, and critical points.
Attention: The axes of the diagram are not shown true to scale.

Information and ideas:
This diagram also reflects the density anomaly of water (lower density in the solid state than in the liquid state): The melting pressure curve shows a negative slope. The reason for the density anomaly is the hydrogen bonds.
Phase diagram of water (Interactive)
Chemistry; Physics; Technology
Grade 7 to 9; Grade 10 to 13
Middle/high school
Chart; Energy; State of aggregation; Steam engine; Turbine
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