R-value
noun Etymology: probably from thermal resistance Date: 1948 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

New Collegiate Dictionary. 2001.

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  • R-value — can refer to: * Properties of materials: **R value (insulation), the efficiency of insulation **R value (soils), stability of soils and aggregates for pavement construction* r value, in computer science, a value that has an address in a computer… …   Wikipedia

  • R-value — [är′val΄yo͞o] n. a measurement indicating the resistance of a given thickness of material, esp. insulating material, to the flow of heat: the higher the R value, the greater the insulation …   English World dictionary

  • R-Value —   A measure of the capacity of a material to resist heat transfer. The R Value is the reciprocal of the conductivity of a material (U Value). The larger the R Value of a material, the greater its insulating properties.   ***   A measure of a… …   Energy terms

  • R-value — R val•ue [[t]ˈɑrˌvæl yu[/t]] n. bui 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 • Etymology:… …   From formal English to slang

  • R-value — /ahr val yooh/, 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. Cf. U value. [1945 50; R, symbol for… …   Universalium

  • r-value — ˈ ̷ ̷ ¦ ̷ ̷ (ˌ) ̷ ̷ noun Usage: usually capitalized R Etymology: probably from thermal resistance : a measure of resistance to the flow of heat through a given thickness of a material (as insulation) with higher numbers indicating better… …   Useful english dictionary

  • r-value — noun Resistance value A measure of thermal resistance used in domestic insulation …   Wiktionary

  • R-value (insulation) — The R value or R value is a measure of thermal resistance (K·m²/W) [Oak Ridge National Laboratory, [http://www.ornl.gov/sci/roofs+walls/insulation/ins 02.html Which Kind Of Insulation Is Best?] , retrieved 2008 07 13.] used in the building and… …   Wikipedia

  • R-value (soils) — The R Value test, [http://www.dot.ca.gov/hq/esc/ctms/CT 301.pdf California Test 301] , measures the response of a compacted sample of soil or aggregate to a vertically applied pressure under specific conditions. This test is used by Caltrans for… …   Wikipedia

  • Plastic-strain ratio (r-value) — Plastic strain ratio (r value). См. Коэффициент пластической деформации (r величина). (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

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