| Abbreviation | Definition |
|---|---|
| APIMS | Atmospheric Pressure Ionization Mass Spectrometer |
| APIMS | Atmospheric Pressure Ionization Mass Spectroscopy |
| APPLD | Atmospheric Pressure Plasma Liquid Deposition |
| APRL | Atmospheric Physics Research Lab |
| ASAM | All Scale Atmospheric Model |
| ASAP | Atmospheric Solids Analysis Probe |
| ASC | Atmospheric Stability Class |
| ASET | Atmosphere Systems Exposure Targets |
| ASFD | Atmospheric Spray Freeze Drying |
| ASIM | Atmosphere Space Interaction Monitor |
| ASIM | Atmosphere Space Interactions Monitor |
| ATM | Atmospheres the amount |
| ATMOSPHERE | Atmospheric |
| AVAPS | Advanced Vertical Atmospheric Profiling System |
| AVAPS | Airborne Vertical Atmosphere Profiling System |
| AVAPS | Airborne Vertical Atmospheric Profiling System |
| AVE | Atmospheric Vortex Engine |
| AWG | Atmosphere Working Group |
| AWG | Atmospheric Water Generation |
| AWVP | Atmospheric water vapor processing |