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R-value

[ahr-val-yoo] /ˈɑrˌvæl yu/
noun
1.
a measure of the resistance of an insulating or building material to heat flow, expressed as R-11, R-20, and so on; the higher the number, the greater the resistance to heat flow.
Compare U-value.
Origin
1945-1950
1945-50; R, symbol for resistance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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