R value
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engineering A unit of thermal insulation, expressed in terms of °F·ft2·h·Btu-1. Its reciprocal, for a given time and area, is U factor. Under the SI, this is expressed as RSI value = 0.176~ × R value.
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Oxford Dictionary of Units & Measures
A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved.
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