prim - pump
- primary combustion
- primary discharge
- primary ion
- primary ion-selective electrode
- primary pH standards
- primary radiation
- primary refence standards
- primary source
- primary standard
- primary standard solution
- primary substance
- principal gas
- prism base
- progenitor ion
- program
- programme
- programmed current chronopo-tentiometry
- projection screen
- prolate trochoidal mass spectrometer
- prompt coincidence
- prompt neutron
- proportional counter tube
- proton
- proton number
- protonation constant
- protonation equilibria
- pulse amplifier
- pulse amplitude analyser
- pulse amplitude distribution
- pulse amplitude selector
- pulse duration
- pulse energy
- pulse height analyser
- pulse polarography
