R-value
R-value is a term referring to properties of materials:
- Insulation: R-value (insulation)
- Soils and aggregates: R-value (soils)
r-value, usually uncapitalized, is also term used in Computer science. See the article on Value (computer science).
In crystallography, the R-factor (also known as R-value), is a measure of the agreement between the crystallographic model and the diffraction data.