#### Fluid models with linear compressibility, using
PartialLinearFluid as base class.

The linear compressibility fluid models contained in this
package are based on the assumptions that:

- The specific heat capacity at constant pressure (cp) is
constant
- The isobaric expansion coefficient (beta) is constant
- The isothermal compressibility (kappa) is constant
- Pressure and temperature are used as states

This results in models that are only valid for small temperature
ranges, but sufficient to model compressibility and e.g., the
"water hammer" effect. Another advantage id that only 3 values need
to be measured to have an initial model. Hydraulic fluids can often
be approximated by this type of model.

That means that the density is a linear function in temperature
and in pressure. In order to define the complete model, a number of
constant reference values are needed which are computed at the
reference values of the states pressure p and temperature T. The
model can be interpreted as a linearization of a full non-linear
fluid model (but it is not linear in all thermodynamic
coordinates). Reference values are needed for

- the density (reference_d),
- the specific enthalpy (reference_h),
- the specific entropy (reference_s).

Apart from that, a user needs to define the molar mass,
MM_const. Note that it is possible to define a fluid by computing
the reference values from a full non-linear fluid model by
computing the package constants using the standard functions
defined in a fluid package (see example in Common,
LinearWater_pT).

## Contents

Name |
Description |

Common |
Base classes for compressible liquids |

LinearColdWater |
Cold water model with linear compressibility |

LinearWater_pT_Ambient |
Liquid, linear compressibility water model at 1.01325 bar and
25 degree Celsius |

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