| Abbreviation | Definition |
|---|---|
| PSSC | Progress in Solid State Chemistry |
| PSTM | Photon Scanning Tunneling Microscopy |
| PSV | Pressure Safety Valve |
| PT | Phase Transition |
| Pt | Platinum |
| PT | Pressure Transducer |
| PT | Proton Transfer |
| PTA | Purified Terephthalic Acid |
| PTAH | Phosphotungstic Acid Hematoxylin |
| PTB | polypyrimidine-tract-binding |
| PTBBA | P-Tert-Butyl Benzoic Acid (manufactured chemical additive) |
| PTBT | Para-Tertiary-Butyl-Phenol |
| PTC | Positive Temperature Coefficient |
| PTCCB | Pesticide and Toxic Chemical Control Board |
| PTCCB | Pesticides and Toxic Chemical Control Board |
| PTCL | Physical and Theoretical Chemistry Lab |
| PTCL | Physical and Theoretical Chemistry Laboratory |
| PTCM | Post translational chemical medication |
| PTFE | Polytetrafluoroethylene |
| PTG | Pressure Time Governor |