R–value

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noun \ˈär-ˌval-(ˌ)yü\

Definition of R–value

  1. :  a measure of resistance to the flow of heat through a given thickness of a material (such as insulation) with higher numbers indicating better insulating properties — compare u-value

Origin and Etymology of r–value

probably from thermal resistance


First Known Use: 1948


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the art of making engravings on wood

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