- Polio
- Polished concrete
- Polishing
- Pollen
- Pollucite
- Pollutants
- Pollution
- Polonium
- Polonium-210
- Polyacetylene
- Polyacrylonitrile
- Polyaddition
- Polyamide
- Polyamines
- Polyaniline
- Polyatomic ions
- Polybutylene
- Polycarbonate
- Polychlorinated biphenyls
- Polychlorinated dibenzodioxins
- Polycrystalline silicon
- Polycyclic aromatic hydrocarbons
- Polydimethylsiloxane
- Polyelectrolytes
- Polyester
- Polyester resin
- Polyether ether ketone
- Polyethylene
- Polyethylene glycol
- Polyethylene terephthalate
- Polyethylenimine
- Polyglycolide
- Polygon
- Polyhalite
- Polyhedron
- Polyimide
- Polyisoprene
- Polylactic acid
- Polymer adsorption
- Polymer brush
- Polymer concrete
- Polymer degradation
- Polymer engineering
- Polymer fume fever
- Polymer matrix composites
- Polymer science
- Polymerization
- Polymorphism
- Polynucleotide
- Polyolefins
- Polyols
- Polyoxymethylene
- Polyphenyl ether
- Polyphenylene sulfide
- Polyphosphate
- Polypropylene
- Polysaccharides
- Polystyrene
- Polysulfide
- Polytetrafluoroethylene
- Polythiophene
- Polyurethane
- Polyuria
- Polyvinyl acetate
- Polyvinyl butyral
- Polyvinyl chloride
- Ponding
- Ponds
- Poppet valves
- Porcelain
- Porcelain tile
- Pore space in soil
- Pore water pressure
- Poromechanics
- Porosimetry
- Porosity
- Porous media
- Porphobilinogen
- Porphyrin
- Porphyritic
- Porphyry
- Portland cement
- Portlandite
- Positive pressure
- Positron emission
- Positrons
- Post and lintel
- Post-transition metals
- Post-translational modification
- Posterior cranial fossa
- Potash
- Potassium
- Potassium acetate
- Potassium alum
- Potassium bicarbonate
- Potassium carbonate
- Potassium channels
- Potassium chlorate
- Potassium chromate
- Potassium dichromate
- Potassium formate
- Potassium hydroxide
- Potassium nitrate
- Potassium oxide
- Potassium permanganate
- Potassium sulfate
- Potassium superoxide
- Potassium thiocyanate
- Potassium-40
- Potential energy
- Potentiometers
- Potentiometric titration
- Potholes
- Potting
- Pound per square inch
- Pounds
- Pourbaix diagram
- Powder
- Powder coating
- Powder diffraction
- Powder metallurgy
- Power cable
- Power density
- Power electronics
- Power factor
- Power hammers
- Power management
- Power of 10
- Power rating
- Power semiconductor device
- Power stations
- Power steering
- Power supply
- Power system protection
- Power tools
- Power transmission
- Power-law fluid
- Power-to-weight ratio
- Powertrain
- Pozzolan
- Pozzolana
- Pozzolanic activity
- Pre-preg
- Precast concrete
- Precession
- Precipitation
- Precipitation hardening
- Precision engineering
- Prefabrication
- Pregnancy