| Abbreviation | Definition |
|---|---|
| RESAC | Rapid Electrochemical Screening of Antioxidant Capacity |
| RESAC | Respiratory Effects of Silver and Carbon Nanoparticles |
| RESV | Resveratrol |
| RF | Resonance Frequency |
| Rf | Rutherfordium |
| RFC | Residual Functional Capacity |
| RFI | Relative Flourescence Intensity |
| RFIC | Reagent-Free Ion Chromatography |
| RFM | Relative Formula Mass |
| RFNA | Red Fuming Nitric Acid |
| RFNA | Red Fuming Nitrous Acid |
| RG | Rare Gas |
| Rg | roentgenium |
| RGA | Residual Gas Analyzer |
| RGAR | Review Group on Acid Rain |
| RGFE | Rutherford Gold Foil Experiment |
| Rh | Rhodium |
| RHA | Resilient Hyaluronic Acid |
| RHE | Reversible Hydrogen Electrode |
| RHPA | Reverse Hemolytic Plaque Assay |