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This R factor corresponds to the relative motions occurred during molecular dynamics (see more at flexibility ).
The R-factor measures the resistance of heat transfer of certain materials.
For the R-factor, the higher the number means that the materials are insulated better.
If a window has a high R-factor and a low U-factor then this window is very energy efficient, which drives up the price.
Insulating material is rated based on its R-Factor, a function of thermal resistance, or the ability of the medium to insulate against heat loss.