| Acronym | Meaning |
| PTSA | Pressure And Temperature Swing Adsorption |
| CCS | Corrected Coupled-states (method For Mol.-scattering Calcns.) |
| UCG | Underground Coal Gasification |
| MSCE | Modified Semiclassical Exchange (aproxn. In Scattering Calcns.) |
| PETP | Poly(ethylene Terephthalate) |
| GSFC | Goddard Space Flight Center (of NOAA |
| CESE | Complex Eigenvalue Shroedinger Equation |
| ICM | Injection Compression Molding |
| HEC | Human Equivalent Concentration |
| HFEGE | Hara Free-electron-gas Exchange (potential) |