Thermal resistance to conduction
================================

Thermal resistance to conduction is a physical quantity that was introduced in the engineering
practice for insulators: greater values of thermal resistance mean better insulation properties of
a material of given thickness.

**Links:**

#. `Wikipedia <https://en.wikipedia.org/wiki/Thermal_conductivity_and_resistivity#Other_quantities>`__.

.. py:currentmodule:: symplyphysics.definitions.thermal_resistance_to_conduction

.. py:data:: thermal_insulance

    :attr:`~symplyphysics.symbols.thermodynamics.thermal_insulance` of the insulator, also called an **R-value**.

Symbol:
    :code:`R_val`

Latex:
    :math:`R_\text{val}`

Dimension:
    :code:`area*temperature/power`


.. py:data:: slab_thickness

    :attr:`~symplyphysics.symbols.classical_mechanics.thickness` of the insulator.

Symbol:
    :code:`h`

Latex:
    :math:`h`

Dimension:
    :code:`length`


.. py:data:: thermal_conductivity

    :attr:`~symplyphysics.symbols.thermodynamics.thermal_conductivity` of the insulating material.

Symbol:
    :code:`k`

Latex:
    :math:`k`

Dimension:
    :code:`power/(length*temperature)`


.. py:data:: definition

    :code:`R_val = h / k`


    Latex:
        .. math::
            R_\text{val} = \frac{h}{k}