Critical pressure
=================

Critical pressure in a van der Waals fluid depends on the parameters :math:`a` and
:math:`b` of the van der Waals equation. See :ref:`vdw_critical_parameters_def`.

**Links:**

#. `Wikipedia <https://en.wikipedia.org/wiki/Van_der_Waals_equation#Critical_point_and_corresponding_states>`__.

.. py:currentmodule:: symplyphysics.laws.thermodynamics.equations_of_state.van_der_waals.critical_pressure

.. py:data:: critical_pressure

    Critical :attr:`~symplyphysics.symbols.classical_mechanics.pressure` of the van der Waals fluid.

Symbol:
    :code:`p_c`

Latex:
    :math:`p_\text{c}`

Dimension:
    :code:`pressure`


.. py:data:: attractive_forces_parameter

    :attr:`~symplyphysics.symbols.thermodynamics.attractive_forces_parameter`.

Symbol:
    :code:`a`

Latex:
    :math:`a`

Dimension:
    :code:`pressure*volume**2/amount_of_substance**2`


.. py:data:: excluded_volume_parameter

    :attr:`~symplyphysics.symbols.thermodynamics.excluded_volume_parameter`.

Symbol:
    :code:`b`

Latex:
    :math:`b`

Dimension:
    :code:`volume/amount_of_substance`


.. py:data:: law

    :code:`p_c = a / (27 * b^2)`


    Latex:
        .. math::
            p_\text{c} = \frac{a}{27 b^{2}}