Radiant exitance is radiant flux emitted per unit area
======================================================

**Radiant exitance**, or **radiant emittance** is the radiant flux emitted by a surface per unit area.

**Notation:**

#. The subscript :math:`e` stands for *energetic* to avoid confusion with photometric quantities.

**Links:**

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

.. py:currentmodule:: symplyphysics.definitions.radiant_exitance_is_radiant_flux_emitted_per_unit_area

.. py:data:: radiant_exitance

    :attr:`~symplyphysics.symbols.optics.radiant_exitance` of the surface.

Symbol:
    :code:`M_e`

Latex:
    :math:`M_\text{e}`

Dimension:
    :code:`power/area`


.. py:data:: area

    :attr:`~symplyphysics.symbols.classical_mechanics.area` of the surface.

Symbol:
    :code:`A`

Latex:
    :math:`A`

Dimension:
    :code:`area`


.. py:data:: radiant_flux

    :attr:`~symplyphysics.symbols.optics.radiant_flux` emitted from the surface as a function of :attr:`~area`.

Symbol:
    :code:`Phi_e(A)`

Latex:
    :math:`\Phi_\text{e}{\left(A \right)}`

Dimension:
    :code:`power`


.. py:data:: definition

    :code:`M_e = Derivative(Phi_e(A), A)`


    Latex:
        .. math::
            M_\text{e} = \frac{d}{d A} \Phi_\text{e}{\left(A \right)}