U-value
[yoo-val-yoo]
- a measure of the flow of heat through an insulating or building material: the lower the U-value, the better the insulating ability.
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Compare R-value.
Origin of U-value
1945–50; U, symbol for internal energy
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018