| Abbreviation | Definition |
|---|---|
| QPY | QuaterPYridine |
| QR | Quantized Reduction |
| QS | Quality Systems |
| QS | QuickSilver |
| QSAR | Quantitative Structure Activity Relationship |
| QSPC | Canonical Spagyric Quintessence Of Paracelsus |
| QUANT | QUANTity |
| QUT | Quinic Acid Utilization |
| QVL | Quantum Vortex Liquid |
| QWIP | Quantum Well Infrared Photodetector |
| R | Ideal Gas Constant (8.314 joules per Kelvin) |
| R | Radiancy |
| R | Radiation |
| R | Rankine Temperature Scale |
| R | Reactive |
| R | Reamer Temperature Ratio |
| R | Recipe |
| R | Redux |
| R | Refinement |
| R12 | Dichlorodifluoromethane |