U-value
[ yoo-val-yoo ]
/ ˈyuˌvæl yu /
noun
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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When Did The Letter U Enter The Alphabet?There was no letter U in the alphabet. Well, that’s not the entire story. There was the sound for the letter we call U, but it didn’t look like U. It looked like V. The Classical Latin alphabet had only 23 letters, not the 26 that we have today. (This is why the W looks like a double V but is pronounced like a double …
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. 2019