Index of physics articles (P)

The index of physics articles is split into multiple pages due to its size.

To navigate by individual letter use the table of contents below.

P

 * P-adic quantum mechanics
 * P-factor
 * P-form electrodynamics
 * P-nuclei
 * P-process
 * P-type semiconductor
 * P-wave
 * P-wave modulus
 * P. Buford Price
 * P3M
 * PACER (fusion)
 * PANDA experiment
 * PAR thrust
 * PEPS effect
 * PETRA
 * PGM-19 Jupiter
 * PHENIX
 * PHOBOS experiment
 * PHOSFOS
 * PICASSO
 * PIND
 * PITZ
 * PLATYPUS
 * PLUTO reactor
 * PM3 (chemistry)
 * POLYGON experiment
 * POVM
 * PQS (chemical)
 * PS210 experiment
 * PSR B1828-10
 * PSR B1913+16
 * PSR J0737-3039
 * PSR J1614–2230
 * PUREX
 * PVLAS
 * PVT (physics)
 * PWscf
 * PYTHIA
 * Padma Kant Shukla
 * Padre Bancalari
 * Painlevé paradox
 * Pair-instability supernova
 * Pair annihilation
 * Pair distribution function
 * Pair potential
 * Pair production
 * Pake doublet
 * Pakistan Institute of Nuclear Science and Technology
 * Pakistan Physics Society
 * Panayotis Varotsos
 * Pandemonium effect
 * Panemone windmill
 * Panofsky Prize
 * Pantur Silaban
 * Paolo Casati
 * Papaloizou–Pringle instability
 * Papapetrou–Dixon equations
 * Papkovich–Neuber solution
 * Parabolic trajectory
 * Parabolic trough
 * Parachor
 * Paracrystalline
 * Paraelectricity
 * Parafoil
 * Paraformer
 * Parallax barrier
 * Parallel Worlds (book)
 * Parallel axis theorem
 * Parallelogram of force
 * Paramagnetism
 * Parameterized post-Newtonian formalism
 * Parametric array
 * Parametric oscillator
 * Parametric resonance
 * Parasitic drag
 * Parastatistics
 * Parawing
 * Paraxial approximation
 * Parfocal lens
 * Parhelic circle
 * Paris' law
 * Pariser–Parr–Pople method
 * Parity (physics)
 * Parity anomaly
 * Parker Variable Wing
 * Parker spiral
 * Parney Albright
 * Parry arc
 * Parry–Daniels map
 * Parson magneton
 * Partial pressure
 * Partial wave analysis
 * Particle
 * Particle-in-cell
 * Particle-induced X-ray emission
 * Particle-size analysis
 * Particle-size distribution
 * Particle (disambiguation)
 * Particle Data Group
 * Particle acceleration
 * Particle accelerator
 * Particle aggregation
 * Particle astrophysics
 * Particle beam
 * Particle counter
 * Particle decay
 * Particle detector
 * Particle displacement
 * Particle experiments at Kolar Gold Fields
 * Particle horizon
 * Particle identification
 * Particle image velocimetry
 * Particle in a box
 * Particle in a one-dimensional lattice
 * Particle in a ring
 * Particle in a spherically symmetric potential
 * Particle number
 * Particle number operator
 * Particle physics
 * Particle physics and representation theory
 * Particle physics in cosmology
 * Particle radiation
 * Particle segregation
 * Particle shower
 * Particle size
 * Particle size (general)
 * Particle statistics
 * Particle tracking velocimetry
 * Particle velocity
 * Particle velocity level
 * Particle zoo
 * Particulates
 * Partition function (quantum field theory)
 * Partition function (statistical mechanics)
 * Parton (particle physics)
 * Parton distribution function
 * Parvez Butt
 * Parviz Moin
 * Pascal's barrel
 * Pascal's law
 * Pascal (unit)
 * Paschen's law
 * Paschen series
 * Paschen–Back effect
 * Pascual Jordan
 * Pasotron
 * Passive Underwater Fire Control Feasibility System
 * Passive radiator
 * Patch dynamics (physics)
 * Path-ordering
 * Path integral Monte Carlo
 * Path integral formulation
 * Path integral molecular dynamics
 * Pati–Salam model
 * Patricia Lewis (physicist)
 * Patrick Blackett, Baron Blackett
 * Patrick N. Keating
 * Patrick Tabeling
 * Patrick d'Arcy
 * Patterson function
 * Paul-Quentin Desains
 * Paul A. Fleury
 * Paul Alfred Biefeld
 * Paul Auguste Ernest Laugier
 * Paul Callaghan
 * Paul Chaikin
 * Paul Chun (professor)
 * Paul Corkum
 * Paul Davies
 * Paul Dirac
 * Paul Drude
 * Paul E. Klopsteg
 * Paul Ehrenfest
 * Paul Erman
 * Paul Fillunger
 * Paul Flory
 * Paul Frampton
 * Paul G. Hewitt
 * Paul G. Richards
 * Paul Garabedian
 * Paul Gerber
 * Paul Ginsparg
 * Paul Halpern
 * Paul Harteck
 * Paul Horowitz
 * Paul John Ellis
 * Paul Kunz
 * Paul Langevin
 * Paul Lauterbur
 * Paul M. Doty
 * Paul Mackenzie
 * Paul McEuen
 * Paul Moskowitz
 * Paul Neményi
 * Paul O. Müller
 * Paul Painlevé
 * Paul Palmer (physicist)
 * Paul Peter Ewald
 * Paul Richard Heinrich Blasius
 * Paul Rudolph (physicist)
 * Paul Scherrer
 * Paul Scherrer Institute
 * Paul Sophus Epstein
 * Paul Steinhardt
 * Paul Taunton Matthews
 * Paul Townsend
 * Paul Ulrich Villard
 * Paul Weiss (nanoscientist)
 * Pauli equation
 * Pauli exclusion principle
 * Pauli group
 * Pauli matrices
 * Pauline Morrow Austin
 * Pauli–Villars regularization
 * Pavel Cherenkov
 * Pavel Jelínek
 * Pavel Petrovich Parenago
 * Pavle Savić
 * Pawsey Medal
 * Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics
 * Peak expiratory flow
 * Peak kilovoltage
 * Peak signal-to-noise ratio
 * Peakon
 * Pearl vortex
 * Peccei–Quinn theory
 * Peculiar motion
 * Peculiar velocity
 * Peder Oluf Pedersen
 * Pedro Paulet
 * Peierls bracket
 * Peixoto's theorem
 * Pelindaba
 * Pelletron
 * Pencil (optics)
 * Pendulum
 * Pendulum day
 * Pendulum rocket fallacy
 * Peng Huanwu
 * Penguin diagram
 * Penning mixture
 * Penning trap
 * Penrose criterion
 * Penrose diagram
 * Penrose graphical notation
 * Penrose interpretation
 * Penrose process
 * Penrose transform
 * Penrose–Hawking singularity theorems
 * Pentamirror
 * Pentaprism
 * Pentaquark
 * Per-Olov Löwdin
 * Per Arne Rikvold
 * Per Bak
 * Per Carlqvist
 * Percentage of the speed of light
 * Percolation
 * Percolation critical exponents
 * Percolation theory
 * Percolation threshold
 * Percus–Yevick approximation
 * Percy Williams Bridgman
 * Peregrine soliton
 * Perfect Cosmological Principle
 * Perfect conductor
 * Perfect fluid
 * Perfect gas
 * Perfect lens
 * Perfect mirror
 * Perfectly Reasonable Deviations from the Beaten Track
 * Perhapsatron
 * Perifocal coordinate system
 * Perigean spring tide
 * Perimeter Institute for Theoretical Physics
 * Period-doubling bifurcation
 * Period 9 element
 * Periodic poling
 * Periodic table
 * Periodicity (metamaterials)
 * Periodogram
 * Perley Ason Ross
 * Perley G. Nutting
 * Perlin noise
 * Permeability (electromagnetism)
 * Permeability constant
 * Permeameter
 * Permeance
 * Permeation
 * Permittivity
 * Perovskite (structure)
 * Perpendicular axis theorem
 * Perpetual motion
 * Perpetual motion machine
 * Perrin friction factors
 * Persis Drell
 * Persistence length
 * Person-rem/year
 * Perturbation theory
 * Perturbation theory (quantum mechanics)
 * Perturbative QCD
 * Perveance
 * Pervez Hoodbhoy
 * Peskin–Takeuchi parameter
 * Peter A. Sturrock
 * Peter A. Wolff
 * Peter Armbruster
 * Peter B. Lyons
 * Peter Barham
 * Peter Bergmann
 * Peter C. Aichelburg
 * Peter Coles
 * Peter Collinson (botanist)
 * Peter Coveney
 * Peter D. Jarvis
 * Peter Debye
 * Peter Demos
 * Peter Dollond
 * Peter Edwards (chemist)
 * Peter Fowler (physicist)
 * Peter Franken
 * Peter Freund
 * Peter Galison
 * Peter Goddard (physicist)
 * Peter Goldreich
 * Peter Grünberg
 * Peter Guthrie Tait
 * Peter Haynes (mathematician)
 * Peter Herbert Jensen
 * Peter Heszler
 * Peter Higgs
 * Peter Hirsch
 * Peter Huybers
 * Peter Hänggi
 * Peter Knight (scientist)
 * Peter Kramer (physicist)
 * Peter Lax
 * Peter Littlewood
 * Peter Lu
 * Peter Mansfield
 * Peter Mazur
 * Peter Pershan
 * Peter Smith (physicist)
 * Peter Stilbs
 * Peter Thejll
 * Peter V. E. McClintock
 * Peter Wadhams
 * Peter Westervelt
 * Peter Woit
 * Peter Zimmerman
 * Peter Zoller
 * Peter van Nieuwenhuizen
 * Petr Beckmann
 * Petr Hořava (theorist)
 * Petr Paucek
 * Petr Vaníček
 * Petrophysics
 * Petrov classification
 * Petrus Peregrinus de Maricourt
 * Petzval field curvature
 * Pfeiffer Effect
 * Pfund series
 * Phantom energy
 * Phase-coherent holography
 * Phase-contrast imaging
 * Phase (matter)
 * Phase (waves)
 * Phase Noise
 * Phase compensation
 * Phase contrast microscope
 * Phase contrast microscopy
 * Phase distortion
 * Phase factor
 * Phase noise
 * Phase offset modulation
 * Phase plane
 * Phase portrait
 * Phase problem
 * Phase retrieval
 * Phase space
 * Phase space formulation
 * Phase switch
 * Phase transition
 * Phase velocities
 * Phase velocity
 * Phased-array optics
 * Phased array
 * Phased array ultrasonics
 * Phenomenology (particle physics)
 * Phi meson
 * Phil Williams (Welsh politician)
 * Philip Abelson
 * Philip Beckley
 * Philip Burton Moon
 * Philip Dee
 * Philip J. Dolan
 * Philip J. Morrison
 * Philip L. Roe
 * Philip M. Morse
 * Philip Morrison
 * Philip Russell (physicist)
 * Philip Saffman
 * Philip Warren Anderson
 * Philipp Carl
 * Philipp Lenard
 * Philipp von Jolly
 * Philippe Guyot-Sionnest
 * Philippe Nozières
 * Philippine Nuclear Research Institute
 * Philo of Byzantium
 * Philolaus
 * Philosophical Magazine
 * Philosophical Transactions of the Royal Society A
 * Philosophical interpretation of classical physics
 * Philosophiæ Naturalis Principia Mathematica
 * Philosophy of physics
 * Philosophy of space and time
 * Philosophy of thermal and statistical physics
 * Phobos (experiment)
 * Phon
 * Phonomotor
 * Phonon
 * Phonon drag
 * Phonon noise
 * Phononic crystal
 * Phosphor
 * Phosphor thermometry
 * Phosphorescence
 * Phosphoroscope
 * Phoswich detector
 * Phot
 * Phot. Nano. Fund. Appl.
 * Phot Nano Fund Appl
 * Photo-Carnot engine
 * Photo-Dember
 * Photobleaching
 * Photochromic lens
 * Photoconduction
 * Photoconductive atomic force microscopy
 * Photoconductivity
 * Photodetector
 * Photodisintegration
 * Photodissociation
 * Photoelastic modulator
 * Photoelasticity
 * Photoelectric effect
 * Photoelectric efficiency
 * Photoelectric sensor
 * Photoelectrochemical processes
 * Photoemission spectroscopy
 * Photoexcitation
 * Photofission
 * Photographic lens design
 * Photographic magnitude
 * Photographic plate
 * Photoinduced charge separation
 * Photoinduced phase transitions
 * Photoionisation
 * Photoionisation cross section
 * Photolithography
 * Photoluminescence
 * Photomagnetic effect
 * Photomagnetism
 * Photomagneton
 * Photometer
 * Photometric redshift
 * Photometry (optics)
 * Photomixing
 * Photomultiplier
 * Photon
 * Photon-in-photon-out
 * Photon-intermediate direct energy conversion
 * Photon Doppler velocimetry
 * Photon Factory
 * Photon diffusion
 * Photon entanglement
 * Photon epoch
 * Photon gas
 * Photon induced electric field poling
 * Photon noise
 * Photon polarization
 * Photon sphere
 * Photonic-crystal fiber
 * Photonic crystal
 * Photonic integrated circuit
 * Photonic metamaterial
 * Photonics
 * Photonics Letters of Poland
 * Photonics Society of Poland
 * Photonics and Nanostructures
 * Photonics and Nanostructures: Fundamentals and Applications
 * Photophoresis
 * Photorefractive effect
 * Photoresist
 * Photosensitive glass
 * Photosensitizer
 * Photothermal effect
 * Photothermal optical microscopy
 * Photothermal spectroscopy
 * Photovoltaic effect
 * Photovoltaics
 * Phugoid
 * Phun
 * Phyllis S. Freier
 * Phys.Org
 * Physica (journal)
 * Physica A
 * Physica B
 * Physica C
 * Physica D
 * Physica E
 * Physica Scripta
 * Physica Status Solidi
 * Physica Status Solidi A
 * Physica Status Solidi B
 * Physica Status Solidi C
 * Physica Status Solidi RRL
 * Physical Biology
 * Physical Chemistry Chemical Physics
 * Physical Review
 * Physical Review A
 * Physical Review A: General Physics
 * Physical Review E
 * Physical Review Focus
 * Physical Review Letters
 * Physical Science Study Committee
 * Physical Society of Japan
 * Physical Society of London
 * Physical acoustics
 * Physical body
 * Physical constant
 * Physical cosmology
 * Physical geodesy
 * Physical law
 * Physical objects
 * Physical optics
 * Physical paradox
 * Physical phenomenon
 * Physical property
 * Physical quantity
 * Physical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
 * Physical strength
 * Physical substance
 * Physical system
 * Physical theories modified by general relativity
 * Physicist
 * Physicist and Christian
 * Physics
 * PhysicsWeb
 * Physics (American Physical Society journal)
 * Physics Abstracts
 * Physics Abstracts. Science Abstracts. Series A
 * Physics Abstracts - Series A
 * Physics Abstracts - Series A: Science Abstracts
 * Physics Abstracts Series A
 * Physics Analysis Workstation
 * Physics Education
 * Physics Letters
 * Physics Letters A
 * Physics Letters B
 * Physics Reports
 * Physics Today
 * Physics and Astronomy Classification Scheme
 * Physics and Chemistry of Liquids
 * Physics and Chemistry of Minerals
 * Physics and Star Trek
 * Physics and engineering explorations
 * Physics beyond the Standard Model
 * Physics education
 * Physics envy
 * Physics equations
 * Physics in Medicine and Biology
 * Physics in medieval Islam
 * Physics of Fluids
 * Physics of Life Reviews
 * Physics of Plasmas
 * Physics of computation
 * Physics of firearms
 * Physics of glass
 * Physics of skiing
 * Physics of the Impossible
 * Physics of the Solid State
 * Physics Today
 * Physikalisch-Technische Bundesanstalt
 * Physikalische Blätter
 * Physikalische Zeitschrift
 * Pi Josephson junction
 * Piara Singh Gill
 * Picard horn
 * Picarin
 * Picotechnology
 * Picture (string theory)
 * Piermaria Oddone
 * Piero Giorgio Bordoni
 * Pierre-Gilles de Gennes
 * Pierre-Michel Duffieux
 * Pierre-Simon Laplace
 * Pierre Aigrain
 * Pierre Angénieux
 * Pierre Auger Observatory
 * Pierre Bertholon de Saint-Lazare
 * Pierre Bouguer
 * Pierre Curie
 * Pierre Goldschmidt
 * Pierre Henri Hugoniot
 * Pierre Hohenberg
 * Pierre Louis Dulong
 * Pierre Louis Maupertuis
 * Pierre Perrault (scientist)
 * Pierre Polinière
 * Pierre Prévost
 * Pierre Ramond
 * Pierre Victor Auger
 * Pierre Weiss
 * Pierson–Moskowitz spectrum
 * Pieter Kok
 * Pieter Rijke
 * Pieter Zeeman
 * Pieter van Musschenbroek
 * Piezoelectric coefficient
 * Piezoelectricity
 * Piezoresistive effect
 * Piezoresponse force microscopy
 * Pilot wave
 * Pin group
 * Pinch (magnetic fusion)
 * Pinch (plasma physics)
 * Pincushion distortion
 * Pink noise
 * Pinning force
 * Piola-Kirchhoff stress tensor
 * Pion
 * Pion decay constant
 * Pioneer anomaly
 * Pionium
 * Pipe flow
 * Pipe network analysis
 * Pis'ma v Astronomicheskii Zhurnal
 * Piston (optics)
 * Pit (nuclear weapon)
 * Pitch-up
 * Pitch drop experiment
 * Pitching moment
 * Pitot tube
 * Piyare Jain
 * Planar array radar
 * Planar laser-induced fluorescence
 * Planck's law
 * Planck (spacecraft)
 * Planck angular frequency
 * Planck charge
 * Planck constant
 * Planck current
 * Planck density
 * Planck energy
 * Planck epoch
 * Planck force
 * Planck impedance
 * Planck length
 * Planck mass
 * Planck matter
 * Planck momentum
 * Planck particle
 * Planck postulate
 * Planck power
 * Planck pressure
 * Planck radiation
 * Planck scale
 * Planck temperature
 * Planck time
 * Planck units
 * Planck voltage
 * Plane mirror
 * Plane of incidence
 * Plane of reference
 * Plane wave expansion method
 * PlanetPhysics
 * Planetarium hypothesis
 * Planetary and Space Science
 * Planetary nebula
 * Planetary nebula luminosity function
 * Planets beyond Neptune
 * Plasma (physics)
 * Plasma Physics Laboratory (Saskatchewan)
 * Plasma Science Society of India
 * Plasma Sources Science and Technology
 * Plasma acceleration
 * Plasma channel
 * Plasma cleaning
 * Plasma containment
 * Plasma cosmology
 * Plasma diagnostics
 * Plasma facing material
 * Plasma fountain
 * Plasma gasification
 * Plasma globe
 * Plasma lamp
 * Plasma modeling
 * Plasma oscillation
 * Plasma parameter
 * Plasma parameters
 * Plasma propulsion engine
 * Plasma recombination
 * Plasma scaling
 * Plasma source
 * Plasma speaker
 * Plasma stability
 * Plasma stealth
 * Plasma torch
 * Plasma weapon
 * Plasma window
 * Plasmaron
 * Plasmasphere
 * Plasmat lens
 * Plasmoid
 * Plasmon
 * Plasmonic cover
 * Plasmonic metamaterials
 * Plasmonic solar cell
 * Plastic-clad silica fiber
 * Plastic Fantastic: How the Biggest Fraud in Physics Shook the Scientific World
 * Plastic bending
 * Plastic deformation in solids
 * Plastic magnet
 * Plastic moment
 * Plasticity (physics)
 * Plastometer
 * Plate tectonics
 * Plateau–Rayleigh instability
 * Platinum Metals Review
 * Plato
 * Platteville Atmospheric Observatory
 * Plebanski action
 * Plekton
 * Pleuger rudder
 * Plug flow
 * Plum pudding model
 * Plume (hydrodynamics)
 * Plummer model
 * Plus minus method
 * Plutonium
 * Plutonium(IV) oxide
 * Plutonium-238
 * Plutonium-239
 * Pneumatic barrier
 * Pneumatic circuit
 * Pneumatic cylinder
 * Pneumatic flow control
 * Pneumatic motor
 * Pockels effect
 * Pohlmeyer charge
 * Poincaré Seminar
 * Poincaré Seminars
 * Poincaré group
 * Poincaré map
 * Poincaré recurrence theorem
 * Poincaré–Bendixson theorem
 * Poincaré–Lindstedt method
 * Poinsot's ellipsoid
 * Point charge
 * Point mass
 * Point particle
 * Point source
 * Point source (light)
 * Point spread function
 * Poise
 * Poisson's equation
 * Poisson's ratio
 * Poisson bracket
 * Poisson–Boltzmann equation
 * Pol Duwez
 * Pol Swings
 * Polar cyclone
 * Polar mesosphere summer echoes
 * Polar moment of inertia
 * Polar orbit
 * Polar vortex
 * Polar wander
 * Polar wind
 * Polarimetry
 * Polariton
 * Polariton superfluid
 * Polarity (disambiguation)
 * Polarizability
 * Polarizable vacuum
 * Polarization-division multiplexing
 * Polarization (waves)
 * Polarization density
 * Polarization in astronomy
 * Polarization mode dispersion
 * Polarization spectroscopy
 * Polarized target
 * Polarizer
 * Polaroid (polarizer)
 * Polaron
 * Polhode
 * Polyakov action
 * Polyamorphism
 * Polychromatic
 * Polychromator
 * Polykarp Kusch
 * Polymer Bulletin
 * Polymer physics
 * Polymer science
 * Polymer solar cell
 * Polymeric liquid crystal
 * Polyphase coil
 * Polyphase system
 * Polytrope
 * Polytropic process
 * Polywater
 * Polywell
 * Pomeranchuk Prize
 * Pomeron
 * Ponderomotive energy
 * Ponderomotive force
 * Pons-Fleischmann experiment
 * Pontecorvo–Maki–Nakagawa–Sakata matrix
 * Poole–Frenkel effect
 * Pople notation
 * Population I Cepheid
 * Population I Cepheids
 * Population inversion
 * Poromechanics
 * Pororoca
 * Portevin–Le Chatelier effect
 * Posidonius
 * Position and momentum space
 * Position operator
 * Position space
 * Positive displacement meter
 * Positive energy theorem
 * Positive pressure
 * Positron
 * Positron emission
 * Positron emission tomography
 * Positronium
 * Positronium hydride
 * Post-Hartree–Fock
 * Post-Newtonian expansion
 * Post Office Box (electricity)
 * Postulates of special relativity
 * Potassium titanyl phosphate
 * Potential
 * Potential difference
 * Potential energy
 * Potential energy surface
 * Potential flow
 * Potential gradient
 * Potential temperature
 * Potential theory
 * Potential vorticity
 * Potential well
 * Potentiometric surface
 * Potsdam Denkschrift
 * Potts model
 * Poul la Cour
 * Pound–Rebka experiment
 * Powder-in-tube
 * Powder diffraction
 * Power-law fluid
 * Power-law index profile
 * Power-to-weight ratio
 * Power (physics)
 * Power density
 * Power history
 * Power number
 * Power optimizer
 * Powered hang glider
 * Poynting's theorem
 * Poynting vector
 * Pp-wave spacetime
 * Prabhakar Misra
 * Prabhu Lal Bhatnagar
 * Pran Nath
 * Prandtl-Glauert method
 * Prandtl number
 * Prandtl–Glauert singularity
 * Prandtl–Glauert transformation
 * Prandtl–Meyer expansion fan
 * Prandtl–Meyer function
 * Praveen Chaudhari
 * Pre-echo
 * Pre-main-sequence star
 * Precession
 * Precision Array for Probing the Epoch of Reionization
 * Precision tests of QED
 * Predhiman Krishan Kaw
 * Predictability
 * Predrag Cvitanović
 * Preferential concentration
 * Preferred frame
 * Pregeometry (physics)
 * Premelting
 * Preon
 * Preon star
 * Present
 * Presentism (philosophy of time)
 * Pressure
 * Pressure-correction method
 * Pressure-fed engine (rocket)
 * Pressure-gradient force
 * Pressure-sensitive paint
 * Pressure coefficient
 * Pressure drop
 * Pressure exchanger
 * Pressure experiment
 * Pressure head
 * Pressure measurement
 * Pressure volume diagram
 * Press–Schechter formalism
 * Primakoff effect
 * Primary field
 * Primary flow element
 * Primitive cell
 * Primitive equations
 * Primon gas
 * Primordial black hole
 * Primordial isocurvature baryon model
 * Primordial nuclide
 * Primum Mobile
 * Princeton Plasma Physics Laboratory
 * Princeton ocean model
 * Principal axis (mechanics)
 * Principal quantum number
 * Principle of Calorimetry
 * Principle of corresponding states
 * Principle of inertia (physics)
 * Principle of least action
 * Principle of locality
 * Principle of material objectivity
 * Principle of maximum entropy
 * Principle of maximum work
 * Principle of minimum energy
 * Principle of relativity
 * Principles of Quantum Mechanics
 * Prism (optics)
 * Prism compressor
 * Probability amplitude
 * Probability current
 * Probing Lensing Anomalies Network
 * Proca action
 * Proceedings of SPIE
 * Proceedings of the Physical Society
 * Proceedings of the USSR Academy of Sciences
 * Process function
 * Prodicus
 * Prof. Eleftheriades
 * Professor Eleftheriades
 * Progress in Electromagnetics Research
 * Progress in Materials Science
 * Progress in Optics
 * Progress in Physics
 * Progress of Theoretical Physics
 * Progress of Theoretical Physics Supplement
 * Project Mohole
 * Project Tuva
 * Projectile motion
 * Projection method (fluid dynamics)
 * Projective superspace
 * Prompt critical
 * Prompt gamma neutron activation analysis
 * Prompt neutron
 * Prony equation
 * Propagation constant
 * Propagation delay
 * Propagator
 * Propellant mass fraction
 * Proper acceleration
 * Proper frame
 * Proper length
 * Proper motion
 * Proper orbital elements
 * Proper time
 * Proper velocity
 * Proportional counter
 * Propulsion
 * Propulsive efficiency
 * Prosper-René Blondlot
 * Protogalaxy
 * Proton
 * Proton-to-electron mass ratio
 * Proton Synchrotron
 * Proton Synchrotron Booster
 * Proton decay
 * Proton emission
 * Proton spin crisis
 * Protonium
 * Proton–gyromagnetic ratio
 * Proton–proton chain reaction
 * Protoplanetary nebula
 * Protostar
 * Proximity effect (atomic physics)
 * Proximity effect (audio)
 * Przybylski's Star
 * Pseudo-Anosov map
 * Pseudo-Euclidean space
 * Pseudo-Goldstone boson
 * Pseudo-Riemannian manifold
 * Pseudo Stirling cycle
 * Pseudogap
 * Pseudophakic photic phenomena
 * Pseudopotential
 * Pseudorapidity
 * Pseudoscalar
 * Pseudoscalar meson
 * Pseudotensor
 * Pseudovector
 * Pseudovector meson
 * Psi meson
 * Psychic determinism
 * Psychoacoustics
 * Psychrometrics
 * Ptychography
 * Pucadyil Ittoop John
 * Pulsar
 * Pulsar kicks
 * Pulsatile flow
 * Pulse (physics)
 * Pulse forming network
 * Pulse height analyzer
 * Pulsed EPR
 * Pulsed field gradient
 * Pulsed laser deposition
 * Pulsed power
 * Pulsometer steam pump
 * Pump
 * Pumplinx
 * Purcell effect
 * Purdue University Reactor Number One
 * Pure bending
 * Pure gauge
 * Pure shear
 * Pure spinor
 * Pure state
 * Purity (gas)
 * Purity (quantum mechanics)
 * Pwpaw
 * Pyotr Kapitsa
 * Pyotr Lebedev
 * Pyotr Valentinovich Trusov
 * Pyranometer
 * Pyrgeometer
 * Pyroelectric crystal
 * Pyroelectric fusion
 * Pyroelectricity
 * Pyrometer
 * Pyrometry
 * Pythagoras
 * Pythagorean hammers
 * Pål Brekke
 * Péclet number
 * P–n junction