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

question 6

Multiple Choice

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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