DEFINITIONS

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.

Content related to U-value

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 …
READ MORE
If “W” Is Double U, Why Is It Made Of Two Vs?The 23rd letter of the English alphabet is a bit of a wonder. The humble “w” is the only letter of the alphabet with a three-syllable name. It is also the only letter with a name that does not indicate its phonetic use. The complications of “w” are doublefold because of its name, ‘double u’ and its shape, ‘double v’. What’s going on here? In English, …
READ MORE
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