Model **BaseProperties** is a model within package **PartialMedium**
and contains the **declarations** of the minimum number of
variables that every medium model is supposed to support.
A specific medium inherits from model **BaseProperties** and provides
the equations for the basic properties.

The BaseProperties model contains the following **7+nXi variables**
(nXi is the number of independent mass fractions defined in package
PartialMedium):

Variable |
Unit |
Description |

T | K | Temperature |

p | Pa | Absolute pressure |

d | kg/m3 | Density |

h | J/kg | Specific enthalpy |

u | J/kg | Specific internal energy |

Xi[nXi] | kg/kg | Structurally independent mass fractions |

R_s | J/(kg.K) | Specific gas constant (of mixture if applicable) |

MM | kg/mol | Molar mass |

In order to implement an actual medium model, one can extend from this
base model and add **5 equations** that provide relations among
these variables. Equations will also have to be added in order to
set all the variables within the ThermodynamicState record state.

If standardOrderComponents=true, the full composition vector X[nX] is determined by the equations contained in this base class, depending on the independent mass fraction vector Xi[nXi].

Additional **2 + nXi** equations will have to be provided
when using the BaseProperties model, in order to fully specify the
thermodynamic conditions. The input connector qualifier applied to
p, h, and nXi indirectly declares the number of missing equations,
permitting advanced equation balance checking by Modelica tools.
Please note that this doesn't mean that the additional equations
should be connection equations, nor that exactly those variables
should be supplied, in order to complete the model.
For further information, see the Modelica.Media User's guide, and
Section 4.7 (Balanced Models) of the Modelica 3.4 specification.

Name | Description |
---|---|

InputAbsolutePressure | Pressure as input signal connector |

InputSpecificEnthalpy | Specific enthalpy as input signal connector |

InputMassFraction | Mass fraction as input signal connector |

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