text: By integrating the differential form over the materials total surface , we arrive at the integral form of Fouriers law:
  where (including the SI units):
  *  is the thermal power transferred by conduction (in W),
  *  is an oriented surface area element (in m).
  The above differential equation, when integrated for a homogeneous material of 1-D geometry between two endpoints at constant temperature, gives the heat flow rate as
  where
  *  is the time interval during which the amount of heat  flows through a cross-section of the material,
  *  is the cross-sectional surface area,
  *  is the temperature difference between the ends,
  *  is the distance between the ends.
  One can define the (macroscopic) thermal resistance of the 1-D homogeneous material:
  With a simple 1-D steady heat conduction equation which is analogous to the Ohm's law for a simple electric resistance:
  This law forms the basis for the derivation of the heat equation.