noun \ˈär-ˌval-(ˌ)yü\

Definition of R-VALUE

:  a measure of resistance to the flow of heat through a given thickness of a material (as insulation) with higher numbers indicating better insulating properties — compare u-value

Origin of R-VALUE

probably from thermal resistance
First Known Use: 1948


Next Word in the Dictionary: RVer
Previous Word in the Dictionary: RVA
All Words Near: R-value

Seen & Heard

What made you want to look up R-value? Please tell us where you read or heard it (including the quote, if possible).