Intensity of sound wave is rate of energy transfer over area
============================================================

Sound-wave *intensity* at a surface is the average power conveyed by the wave,
per unit area, through or onto that surface.

**Conditions:**

#. The surface is perpendicular to the direction of energy flow.

**Links:**

#. `Wikipedia — Mathematical description <https://en.wikipedia.org/wiki/Intensity_(physics)#Mathematical_description>`__

.. py:currentmodule:: symplyphysics.waves.acoustic_waves.intensity_of_sound_wave_is_rate_of_energy_transfer_over_area

.. py:data:: intensity

    :attr:`~symplyphysics.symbols.basic.intensity` of the sound wave.

Symbol:
    :code:`I`

Latex:
    :math:`I`

Dimension:
    :code:`power/area`


.. py:data:: power

    :attr:`~symplyphysics.symbols.basic.power`, or rate of energy transfer, of the wave.

Symbol:
    :code:`P`

Latex:
    :math:`P`

Dimension:
    :code:`power`


.. py:data:: area

    Surface :attr:`~symplyphysics.symbols.classical_mechanics.area`.

Symbol:
    :code:`A`

Latex:
    :math:`A`

Dimension:
    :code:`area`


.. py:data:: law

    :code:`I = P / A`


    Latex:
        .. math::
            I = \frac{P}{A}