Laplace pressure is pressure difference
=======================================

The **Laplace pressure** is the pressure difference between the inside and the outside of a curved
surface that forms the boundary between two fluid regions. This is caused by the surface tension at
the fluid interface.

The terms *outside* and *inside* are related to the direction dictated by the curvature of the
interface, not by the position relative to the fluid in question.

**Links:**

#. `Wikipedia — Laplace pressure <https://en.wikipedia.org/wiki/Laplace_pressure>`__.

.. py:currentmodule:: symplyphysics.laws.hydro.laplace_pressure_is_pressure_difference

.. py:data:: laplace_pressure

    Laplace :attr:`~symplyphysics.symbols.classical_mechanics.pressure` of the fluid boundary.

Symbol:
    :code:`p_L`

Latex:
    :math:`p_\text{L}`

Dimension:
    :code:`pressure`


.. py:data:: outside_pressure

    :attr:`~symplyphysics.symbols.classical_mechanics.pressure` at the side that the interface is bulging *from*.

Symbol:
    :code:`p_o`

Latex:
    :math:`p_\text{o}`

Dimension:
    :code:`pressure`


.. py:data:: inside_pressure

    :attr:`~symplyphysics.symbols.classical_mechanics.pressure` at the side that the interface is bulging *toward*.

Symbol:
    :code:`p_i`

Latex:
    :math:`p_\text{i}`

Dimension:
    :code:`pressure`


.. py:data:: law

    :code:`p_L = p_o - p_i`


    Latex:
        .. math::
            p_\text{L} = p_\text{o} - p_\text{i}