| Abbreviation | Definition |
|---|---|
| PIPA | Pulsed Integrating Pendulous Accelerometer |
| PIRSA | Perimeter Institute Recorded Seminar Archive |
| PIRT | Physics Instructional Resource Team |
| PISA | Photovoltaic Information System For Architects |
| PISA | Position Intensity And Shape Analysis |
| PISCO | Parallel Imager for Southern Cosmological Observation |
| PIV | Particle Image Velocimetry |
| PIV | Position Information Vector |
| PIXE | Particle Induced X-ray Emission |
| PIYF | Physics in Your Future |
| PJCC | Physics Joint Consultative Committee |
| PKC | Psycho Kinetic Collaboration |
| PKE | Psycho Kinetic Energy |
| PKR | Peak Kinetic Response |
| PL | Physics Laboratory |
| PL | Planck Length |
| PL | Proton Loss |
| PLA | Physics Letters A |
| PLB | Physics Letters B |
| PLM | Polarized light microscopy |