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| Particle Particle Size Parts Per Million (Ppm) Pathogen Peat Pectine Peptide Permeability Pesticides Pext Ph Phagocyte Polymer Prebiotic Probiotic Protein (Protid) Protein-Prion |
| A qualitiative description of the relative ease with which rock, soil or sediment will transmit a fluid (liquid or gas). |