Speed of charged particles in gas via mobility
==============================================

In a gas, the free path length of charged particles is small and the particles, as they
move, experience many collisions in the volume between the electrodes. In this case, the
speed of directional movement will depend not on the potential difference traveled, but
on the local value of the electric intensity.

**Links:**

#. `Wikipedia, derivable from here <https://en.wikipedia.org/wiki/Electron_mobility#>`__.

..
    TODO: rename file
    TODO: create usual law `v = mu * E`

.. py:currentmodule:: symplyphysics.laws.chemistry.velocity_of_directional_motion_of_charged_particles_in_gas

.. py:data:: speed

    :attr:`~symplyphysics.symbols.classical_mechanics.speed` of charged particles in the gas.

Symbol:
    :code:`v`

Latex:
    :math:`v`

Dimension:
    :code:`velocity`


.. py:data:: mobility_at_unit_pressure

    Mobility of charged particles at unit pressure.

Symbol:
    :code:`mu`

Latex:
    :math:`\mu`

Dimension:
    :code:`length*pressure*velocity/voltage`


.. py:data:: pressure

    Pressure in the gas.

Symbol:
    :code:`p`

Latex:
    :math:`p`

Dimension:
    :code:`pressure`


.. py:data:: electric_field_strength

    :attr:`~symplyphysics.symbols.electrodynamics.electric_field_strength`

Symbol:
    :code:`E`

Latex:
    :math:`E`

Dimension:
    :code:`voltage/length`


.. py:data:: law

    :code:`v = mu * E / p`


    Latex:
        .. math::
            v = \frac{\mu E}{p}