The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R₁, R₂ and R₃, the overall R-value of the insulation is given by A) R = R₁ + R₂ + R₃. B) . C) . D) . E) .

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The Answer of The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R₁, R₂ and R₃, the overall R-value of the insulation is given by A) R = R₁ + R₂ + R₃. B) . C) . D) . E) .

The R-Value of an Insulating Material Is the Thickness of the Material