| Abbreviation | Definition |
|---|---|
| PFC | Physics Frontiers Centers |
| PFD | Photon Flux Density |
| PFU | Proton Flux Unit |
| PFW | Propagating Floquet Wave |
| PFX | Penning Fusion eXperiment |
| PFX-I | Penning Fusion eXperiment - Ions |
| PGA | Peak Ground Accerleration |
| PGNAA | Prompt Gamma Neutron Activation Analysis |
| PGO | Physics Graduate Organization |
| PGP | Physics of Geological Processes |
| PGS | Physics Grad Society |
| PGS | Plane Grating Spectrometer |
| PGSC | Physics Graduate Student Council |
| PGSS | Physics Graduate Student Symposium |
| PH | Percentage Hydrogen |
| PHASER | Pulsed High Amplitude Sinusoidal Electromagnetic Radiation |
| PHD | P-Helicity Decoupling Scheme (P=Momentum) |
| PHED | Physics of High Energy Density |
| PhET | Physics Education Technology |
| PHR | Pulse Height Resolution |