R-value

[ ahr-val-yoo ]
/ ˈɑrˌvæl yu /

noun

a measure of the resistance of an insulating or building material to heat flow, expressed as R-11, R-20, and so on; the higher the number, the greater the resistance to heat flow.

QUIZZES

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It’d be a real faux pas to miss this quiz on the words from August 3–9, 2020!
Question 1 of 7
What does “vacillate” mean?
to waver in mind or opinion; be indecisive or irresolute.
to cause to be empty or unoccupied.
to assent tacitly; agree; consent.
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Compare U-value.

Origin of R-value

1945–50; R, symbol for resistance

Words nearby R-value

Ruysch's muscle, Ruysdael, Ruyter, Ružička, RV, R-value, RVH, R.V.S.V.P., R/W, RWA, Rwanda
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020