Science & Engineering
Thermal resistance.
Estimate steady one-dimensional conduction through a single flat layer and see the resulting heat flow.
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Thermal resistance formula
For a flat layer, R = L ÷ (kA) in K/W. The steady heat-transfer rate is Q̇ = ΔT ÷ R. This model assumes constant conductivity, a uniform area, and negligible contact and convection resistances.
Reference: MIT, Thermal Resistance Circuits and MIT, Introduction to Conduction.
Heat-transfer note
Real assemblies often need contact, convection, radiation, and multiple-layer resistances included separately.