part - pick
- permeability number
- permeability testing apparatus
- permeameter
- permendur
- permitted (energy) level
- permitted energy band
- perpendicular magnetization
- Perrin process
- persistant oscillations
- persistent band
- pertial annealing
- perturbation-sensitive properties
- perturbed (energy) level
- perturbed lattice
- pestle
- petrographic analysis
- petrographic constituent
- petrographic microscope
- petroleum coke
- petrology