R-value

(redirected from R value)
Also found in: Financial, Encyclopedia.

R-val·ue

(är′văl′yo͞o)
n.
A measure of the capacity of a material, such as insulation, to impede heat flow, with increasing values indicating a greater capacity. Also called R-factor.

[r(esistance) value.]

R-val•ue

(ˈɑrˌvæl yu)

n.
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. Compare U-value.
[1945–50; R, symbol for resistance]