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7.2.4 Describe the relationship between R-value and U-factor
R-value is resistance to conductive heat flow while U-factor is conductivity
The R-Value is an imperial system unit of measurement (ft2·°F·h/BTU) and the RSI Value is a metric system unit of measurement (m2·K/W).
U-Factor is inverse of R-value or RSI if metric
R = 1/U
U = 1/R
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