paraffin [obsolete] , 1059 parallel reactions, 1059 parallel-chain crystal in polymers , 1059 paramagnetic, 1059 parametric amplification, 1059 parametric processes, 1060 parent hydride, 1060 parent ion in mass spectrometry , 1060 Pariser–Parr–Pople (PPP) method, 1060 partial anodic (cathodic) current, 1060 partial charge exchange reaction, 1061 partial charge transfer reaction, 1061 partial decay constant in nuclear chemistry , 1061 partial digestion in spectrochemical analysis , 1061 partial isotherm (or individual isotherm) in surface chemistry , 1062 partial kinetic current in electrochemistry, 1062 partial least squares (PLS), 1062 partial mass density, , 1062 partial microscopic diffusion control (encounter control) , 1062 partial molar Gibbs energy, 1063 partial molar quantity, 1063 partial pressure, 1063 partial rate factor, 1063 partial specific volume, , 1064 partially draining, 1064 particle concentration in atmospheric chemistry, 1064 particle density in nuclear chemistry , 1065 particle induced X-ray emission analysis, 1065 particle scattering function, 1065 particle size distribution in atmospheric chemistry , 1065 particle size in atmospheric chemistry , 1065 particular property, 1066 particulate carbon, 1066 particulate gel, 1066 particulate matter in atmospheric chemistry , 1066particulate sol, 1067 partition, 1067 partition chromatography, 1067 partition coefficient [obsolete] , 1067 partition constant, , 1067 partition function, 1068 partition isotherm in chromatography , 1068 partition ratio, , 1068 pascal , 1069 passivation in electrochemical corrosion , 1069 passivation potential in electrochemical corrosion , 1069 passive metal, 1069 passive sampler, 1070 passive state in electrochemical corrosion , 1070 Paterno–Büchi reaction, 1070 pattern recognition, 1070 paucidisperse system, 1070