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U-value

[yoo-val-yoo] /ˈyuˌvæl yu/
noun
1.
a measure of the flow of heat through an insulating or building material: the lower the U-value, the better the insulating ability.
Compare R-value.
Origin
1945-1950
1945-50; U, symbol for internal energy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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