About the data

For every temperature and pressure in the plot, the surface shows the density of the phase of water that is stable there. Where two phases coexist, the surface becomes a vertical wall spanning both densities. Looking straight down collapses each wall to a line, which is why the phase diagram is its shadow.

Liquid, vapor, supercritical

IAPWS-95 formulation, evaluated with CoolProp 8.0

Ice Ih

IAPWS R10-06 (2009), via the iapws package

Sublimation and melting

IAPWS R14-08 (2011)

Scales

Temperature linear, 200–800 K. Pressure and density logarithmic. Nothing exaggerated.

Not shown

High-pressure ices (III, V, VI…) appear above 209.9 MPa, beyond this plot.

Generated by scripts/water/generate_surface.py.