# Water density linear model¶

See Example below:

EOS WATER
SURFACE_DENSITY 1004.0 kg/m^3
DENSITY LINEAR 1000.0 1.0D7 4.6D-10
END


Note that in the example above, IFC67 default models are used for viscosity and enthalpy, because no other models are specified.

The three values entered are, in order:

• The reference density, $$\rho_{ref}$$, units kg/m^3

• The reference pressure, $$P_{ref}$$, units Pa

• The water compressibility, $$C$$, units 1/Pa

These values are used in the following model. The density is computed as:

$\rho( P)=\rho_{\mbox{ref}} [1+C (P− P_{\mbox{ref}})]$

Units cannot be entered and the values must be entered in the units reported above.