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Adding insulation to a wall reduces its U-value because insulation has a low

  • A.surface emissivity
  • B.thermal conductivity
  • C.specific heat capacity
  • D.density

Answer: B

A material of conductivity 0.04 contributes twenty-five times the resistance of the same thickness of brick, which is why fifty millimetres transforms a wall. Its low density is a consequence of the trapped air rather than the cause of the insulation.

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