Law of heat conduction
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Newton's law of heat conduction says that the heat flow is proportional to the temperature difference Δ T:

dq/dt = K Δ T

K is the heat resistance of the material over which the temperature difference is maintained.

It is the thermal equivalent of Ohm's law for electric flow; although it is much older it is less known.

See also:

• thermal conductivity

The original article can be found at: http://en.wikipedia.org/wiki/Law_of_heat_conduction.
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