R rating
Encyclopedia
R rating may refer to:
- R - Motion Picture Association of America film rating system
- R-value (insulation)R-value (insulation)The R-value is a measure of thermal resistance used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux through it or R = \Delta T/\dot Q_A.The R-value being discussed is the unit thermal resistance...