R-value meaning

ärvălyo͝o
A measure of the capacity of a material, such as insulation, to impede heat flow, with increasing values indicating a greater capacity.
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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.
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See MOS.
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(computing, programming) Any value that is not an lvalue.
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Resistance-value - A measure of thermal resistance used in domestic insulation.
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Origin of r-value

  • r(esistance) value

    From American Heritage Dictionary of the English Language, 5th Edition

  • As for lvalue, but using r for right-hand side.

    From Wiktionary