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R (1)
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R-value
R-value (plural R-values)


noun 
Definition:
 
measure of insulation ability: a measure of the ability of a material such as insulation to retard heat flow. A higher number indicates better insulating properties.
[Mid-20th century. <r2 'resistance']
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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