| Acronym | Meaning |
| CVB | Canonical Valence Bond |
| PACIMS | Passive Chem. Ionization Mass Spectrometry |
| AIHA | American Industrial Hygiene Association |
| WQI | Water Quality Index |
| UPOT | Union Pacific Oxidation Test |
| HHE | Health Hazard Evaluation |
| PMC | Permanently Manned Capability (of Space Station) |
| DC | Blood-air Distribution Coefficient |
| PSD | Pore Size Distribution |
| RCCSD | (partially) Restricted CCSD |