Heat capacity ratio
===================

The *heat capacity ratio*, also known as the *adiabatic index*, the *ratio of specific heats*, or
the *isentropic expansion factor*, is the ratio of the heat capacity at constant pressure
to that of constant volume. The heat capacity ratio is used in the description of thermodynamic
reversible processes; the speed of sound also depends on this factor.

**Notes:**

#. One can also use intensive heat capacities, such as specific or molar ones, in place of the 
   extensive heat capacity presented here.

**Links:**

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

.. py:currentmodule:: symplyphysics.definitions.heat_capacity_ratio

.. py:data:: heat_capacity_ratio

    :attr:`~symplyphysics.symbols.thermodynamics.adiabatic_index` of the system.

Symbol:
    :code:`gamma`

Latex:
    :math:`\gamma`

Dimension:
    :code:`dimensionless`


.. py:data:: isobaric_heat_capacity

    :attr:`~symplyphysics.symbols.thermodynamics.heat_capacity` of the system at constant pressure.

Symbol:
    :code:`C_p`

Latex:
    :math:`C_{p}`

Dimension:
    :code:`energy/temperature`


.. py:data:: isochoric_heat_capacity

    :attr:`~symplyphysics.symbols.thermodynamics.heat_capacity` of the system at constant volume.

Symbol:
    :code:`C_V`

Latex:
    :math:`C_{V}`

Dimension:
    :code:`energy/temperature`


.. py:data:: definition

    :code:`gamma = C_p / C_V`


    Latex:
        .. math::
            \gamma = \frac{C_{p}}{C_{V}}