The temperature θ at the junction of two insulating sheets, having thermal resistances R 1 and R 2 as well as top and bottom temperatures θ 1 and θ 2 (as shown in figure) is given by :

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Heat flow rate will be same through both ∴ θ 1 - θ R 1 = θ - θ 2 R 2 R 2 θ 1 - R 2 θ = R 1 θ - R 1 θ 2 θ = R 2 θ 1 + R 1 θ 2 R 1 + R 2

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