Enthalpy of dielectrics
=======================

The enthalpy of a system with a dielectric medium can be expressed using
its internal energy and the electric field and electric displacement.

**Conditions:**

#. The dielectric is isotropic whether or not the electric field is present.
#. The medium is homogeneous.
#. The volume change of the medium is insignificant.

**Links:**

#. Formula 31.5 on p. 122 of "General Course of Physics" (Obschiy kurs fiziki), vol. 3 by Sivukhin D.V. (1979).

.. py:currentmodule:: symplyphysics.laws.thermodynamics.dielectrics.enthalpy_formula

.. py:data:: enthalpy_density

    :attr:`~symplyphysics.symbols.thermodynamics.enthalpy` of the system per unit :attr:`~symplyphysics.symbols.classical_mechanics.volume`.

Symbol:
    :code:`H`

Latex:
    :math:`H`

Dimension:
    :code:`energy/volume`


.. py:data:: internal_energy_density

    :attr:`~symplyphysics.symbols.thermodynamics.internal_energy` of the system per units :attr:`~symplyphysics.symbols.classical_mechanics.volume`.

Symbol:
    :code:`U`

Latex:
    :math:`U`

Dimension:
    :code:`energy/volume`


.. py:data:: electric_field_strength

    :attr:`~symplyphysics.symbols.electrodynamics.electric_field_strength` in the medium.

Symbol:
    :code:`E`

Latex:
    :math:`E`

Dimension:
    :code:`voltage/length`


.. py:data:: electric_displacement

    :attr:`~symplyphysics.symbols.electrodynamics.electric_displacement` in the medium.

Symbol:
    :code:`D`

Latex:
    :math:`D`

Dimension:
    :code:`charge/area`