Classical isochoric molar heat capacity of solids
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The *Dulong-Petit law* states that the classical expression for the molar specific heat capacity
of certain chemical elements is constant for temperatures far from the absolute zero.

**Notation:**

#. :math:`R` (:code:`R`) is :attr:`~symplyphysics.quantities.molar_gas_constant`.

**Conditions:**

#. The temperature of the system is big enough to disregard quantum effects.

**Links:**

#. `Wikipedia <https://en.wikipedia.org/wiki/Dulong%E2%80%93Petit_law>`__.

.. py:currentmodule:: symplyphysics.laws.thermodynamics.classical_isochoric_molar_heat_capacity_of_solids

.. py:data:: isochoric_molar_heat_capacity

    :attr:`~symplyphysics.symbols.thermodynamics.molar_heat_capacity` at constant pressure.

Symbol:
    :code:`c_pm`

Latex:
    :math:`c_{p, \text{m}}`

Dimension:
    :code:`energy/(amount_of_substance*temperature)`


.. py:data:: law

    :code:`c_pm = 3 * R`


    Latex:
        .. math::
            c_{p, \text{m}} = 3 R