pp type semiconductorp v apapacked columnpadded ringpaintpaint thinnerpair interactionspaired electronspairingpairing energypalladiumpalm oilpanchromatic emulsionpapainpaper chromatographypaper electrophoresispara directorpara positionparachemistryparaffin oilparaffin waxparahydrogenparallelparamagneticparamagnetic resonanceparamagnetic susceptibilityparamegnetismparameterparctical entropyparent chainparitypartial chargepartial differential equationpartial ionioc characterpartial ionizationpartial molar propertiespartial molar volumepartial pressurepartial volumeparticleparticle growthpartition chromatographypartition coefficientpartition functionpaschen seriespassivatepassivationpassive