.. _gas_const_sec:

Gas constant value properties
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


An example to define a gas with constant properties is given below: ::

  EOS GAS
    SURFACE_DENSITY 1.2 kg/m^3
    DENSITY CONSTANT 200.00d0 kg/m^3
    ENTHALPY CONSTANT 1.8890d0 J/kmol
    VISCOSITY CONSTANT 0.03 cP
  END

The units are optional, if not entered they will take the following defaults:

* density units : :math:`kg/m^3`
* enthalpy units : :math:`J/k\mbox{mol}`
* viscosity units : :math:`Pa.s`