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- P–n diodeA p–n diode is a type of semiconductor diode based upon the p–n junction. The diode conduc
- P–n junctionSemiconductor–semiconductor junction
- Pacific Tsunami Warning CenterTsunami warning center on Ford Island, Hawaii, United States
- Pair productionCreation of particle-antiparticle pair from a neutral boson
- PANDA experimentThe PANDA experiment is a planned particle physics experiment at the Facility for Antiprot
- ParamagnetismWeak, attractive magnetism possessed by most elements and some compounds
- Parameterized post-Newtonian formalismApproximation method for general relativity in physics
- Paratriathlon classificationParatriathlon classification is the classification system for athletes participating in pa
- Parity (physics)Symmetry of spatially mirrored systems
- Park Yung-wooPark Yung-woo (Korean: 박영우, born 1952) is a South Korean physicist, who has worked in the
- Partial pressurePressure of a component gas in a mixture
- ParticleSmall localized object
- Particle acceleratorResearch apparatus for particle physics
- Particle beamStream of charged, or less frequently neutral particles
- Particle decaySpontaneous breakdown of an unstable subatomic particle into other particles
- Particle detectorDevice used to detect, track, and/or identify ionising particles
- Particle displacementMovement of a sound particle
- Particle in a boxMathematical model in quantum mechanics
- Particle numberNumber of particles in a thermodynamic system
- Particle physicsStudy of subatomic particles and forces
- Particle Physics Project Prioritization PanelThe Particle Physics Project Prioritization Panel (P5) is a scientific advisory panel task
- Particle radiationFast-moving particles with energy
- Particle showerIn particle physics, a shower is a cascade of secondary particles produced as the result o
- Particle statisticsDescription of multiple particle in physics
- Particle velocityVelocity of a particle in a medium as it transmits a wave
- Partition function (quantum field theory)Generating function for quantum correlation functions
- Partition function (statistical mechanics)Function in thermodynamics and statistical physics
- Parton (particle physics)Model of hadrons
- Pascal's lawPrinciple in fluid mechanics
- Passau Glass MuseumGlass museum in Passau, Germany
- Pastel (color)Family of pale colors
- Pastry blenderA pastry blender, or pastry cutter, is a device used to mix a hard (solid) fat into flour
- Path integral Monte CarloPath integral Monte Carlo (PIMC) is a quantum Monte Carlo method used to solve quantum sta
- Path-integral formulationFormulation of quantum mechanics
- Patricia BurchatCanadian particle physicist
- Patrick d'ArcyIrish mathematician
- Patrick DiamondPatrick Diamond worked as a policy advisor under the Labour Party government of the United
- Patrick H. DiamondAmerican theoretical plasma physicist
- Pattern formationStudy of how patterns form by self-organization in nature
- Paul CallaghanNew Zealand physicist (1947–2012)
- Paul CorkumCanadian physicist (born 1943)
- Paul DaviesEnglish physicist, writer and broadcaster (born 1946)
- Paul DrudeGerman physicist (1863–1906)
- Paul KearnsPaul K. Kearns is an American physicist. He received his bachelor’s degree from Purdue Uni
- Paul LangevinFrench physicist (1872–1946)
- Paul SiglerPaul B. Sigler (February 19, 1934 – January 11, 2000) was the Henry Ford II Professor of M
- Pauli equationQuantum mechanical equation of motion of charged particles in magnetic field
- Pauli exclusion principleQuantum mechanics principle
- Pauli matricesMatrices important in quantum mechanics and the study of spin
- Pauli–Villars regularizationIn theoretical physics, Pauli–Villars regularization (P–V) is a procedure that isolates di
- Peccei–Quinn theoryIn particle physics, the Peccei–Quinn theory is a well-known, long-standing proposal for t
- Peierls substitutionThe Peierls substitution method, named after the original work by Rudolf Peierls is a wide
- Pendulum (mechanics)Free swinging suspended body
- Penning trapDevice for storing charged particles
- Penrose diagramDiagram of different points in spacetime
- Penrose–Hawking singularity theoremsKey results in general relativity on gravitational singularities
- PentaquarkSubatomic Particle with Five Quarks
- Penumbra (medicine)In pathology and anatomy the penumbra is the area surrounding an ischemic event such as th
- PercolationFiltration of fluids through porous materials
- Peres metricIn mathematical physics, the Peres metric is defined by the proper time
- Perfusion MRIPerfusion MRI or perfusion-weighted imaging (PWI) is perfusion scanning by the use of a pa
- Permeability (electromagnetism)Ability of magnetization
- PermeancePermeance, in general, is the degree to which a material admits a flow of matter or energy
- PermittivityMeasure of the electric polarizability of a dielectric material
- Perovskite (structure)Type of crystal structure
- Perpetual motionWork being continuously done without an external input of energy
- Persis DrellPersis S. Drell is the Provost Emerita and the James and Anna Marie Spilker Professor in t
- Perturbation theoryMethods of mathematical approximation
- Perturbation theory (quantum mechanics)Mathematical approach to quantum physics
- Perturbed angular correlationThe perturbed γ-γ angular correlation, PAC for short or PAC-Spectroscopy, is a method of n
- Pervez HoodbhoyPakistani nuclear physicist and author (born 1950)
- Peter DollondEnglish inventor (1731–1820)
- Peter DuncumbPeter Duncumb FRS FInstP (born 26 January 1931) is a British physicist specialising in X-r
- Petr VaníčekCanadian geodesist
- Phantom dark energyHypothetical form of dark energy
- Phase (matter)Region of uniform physical properties
- Phase (waves)Elapsed fraction of a cycle of a periodic function
- Phase ruleGeneral principle in thermodynamics regarding pVT systems in equilibrium
- Phase transitionPhysical process of transition between basic states of matter
- Phase velocityRate at which the phase of the wave propagates in space
- Phase-space formulationFormulation of quantum mechanics
- Philip H. Knight Chairs and ProfessorshipsPhilip H. Knight endowed chairs and professorships were established at the University of O
- Philip N. BurrowsBritish physicist
- Philosophical presentismView that neither the future nor the past exist, only the present
- Philosophy of physicsTruths and principles of the study of matter, space, time and energy
- PhononQuasiparticle of mechanical vibrations
- Phonon scatteringPhonons can scatter through several mechanisms as they travel through the material. These
- Phosphate glassPhosphor oxide based glass in which SiO2 is replaced by P2O5 as network former
- PhosphorLuminescent substance
- PhosphorescenceLight energy absorbance and re-emission
- PhotocathodeA photocathode is a surface engineered to convert light (photons) into electrons using the
- PhotoconductivityPhotoconductivity is an optical and electrical phenomenon in which a material becomes more
- PhotodisintegrationDisintegration of atomic nuclei from high-energy EM radiation
- Photoelectric effectEmission of electrons when electromagnetic radiation hits a material
- Photoelectrochemical cellSources of electricity or hydrogen via electrolysis
- PhotofissionFission of a nucleus via absorption of a gamma ray
- PhotogramPhotographic technique
- PhotolithographyProcess in microfabrication
- PhotoluminescencePhotoluminescence (abbreviated as PL) is light emission from any form of matter after the
- Photometry (optics)Measurement of visible light
- PhotonElementary particle or quantum of light
- Photon countingPhoton counting is a technique in which individual photons are counted using a single-phot
- Photon energyEnergy carried by a photon
- Photon gasGas-like collection of photons
- Photonic crystalPeriodic optical nanostructure that affects the motion of photons
- Photonic metamaterialType of electromagnetic metamaterial
- PhotonicsTechnical applications of optics
- Photovoltaic effectElectric current generation from light
- Phyllis BoldsAmerican physicist
- Physical constantUniversal and unchanging physical quantity
- Physical objectIdentifiable collection of matter
- Physical opticsBranch of optics
- Physical propertyAttribute of a physical system or body or non-chemical property of a material
- Physical quantityMeasurable property of a material or system
- Physical Society of LondonThe Physical Society of London, England, was a scientific society which was founded in 187
- Physical systemPortion of the universe chosen for analysis
- Physical vapor depositionMethod of coating solid surfaces with thin films
- PhysicistScientist specializing in the field of physics
- PhysicsScientific field of study
- Physics beyond the Standard ModelTheories trying to extend known physics
- Physics educationSet of methods to teach physics
- Piecewise linear functionIn mathematics, a piecewise linear or segmented function is a real-valued function of a re
- Pierre AgostiniFrench physicist (born 1941)
- Pierre BouguerFrench mathematician, physicist, and astronomer (1698–1758)
- Pierre Louis DulongFrench scientist (1785–1838)
- Pierre RamondAmerican physicist
- PiezoelectricityElectric charge generated in certain solids due to mechanical stress
- PilkingtonBritish glass manufacturer
- PinkPale tint of red
- Pink noiseSignal with equal energy per octave
- PionSubatomic particle; lightest meson
- Pipe flowType of liquid flow within a closed conduit
- Pitch drop experimentLong-term experiment measuring the flow of pitch
- Pitcher (container)Container with a spout used for storing and pouring liquids
- Planck (spacecraft)Space observatory
- Planck constantPhysical constant in quantum mechanics
- Planck postulatePrinciple of quantum physics
- Planck relationEnergy–frequency relation in quantum mechanics
- Planck's lawSpectral density of light emitted by a black body
- Planck's principleIn sociology of scientific knowledge, Planck's principle is the view that scientific chang
- Planckian locusLocus of colors of incandescent black bodies within a color space
- Plane of polarizationFor light and other electromagnetic radiation, the plane of polarization is the plane span
- Plane stressIn continuum mechanics, a material is said to be under plane stress if the stress vector i
- Plane waveType of wave propagating in 3 dimensions
- Plasma (physics)State of matter
- Plasma globeDecorative electrical device
- Plasma lampPlasma lamps are a type of electrodeless gas-discharge lamp energized by radio frequency (
- Plasma recombinationPhase transition from plasma to gas
- PlasmonQuasiparticle of charge oscillations in condensed matter
- Plasticity (physics)Non-reversible deformation of a solid material in response to applied forces
- Plateau–Rayleigh instabilityIn fluid dynamics, the Plateau–Rayleigh instability, often just called the Rayleigh instab
- Plum pudding modelFirst modern model of the atom
- Plutonium–gallium alloyPlutonium–gallium alloy (Pu–Ga) is an alloy of plutonium and gallium, used in nuclear weap
- Poaching (cooking)Cooking technique
- Poincaré groupGroup of flat spacetime symmetries
- Point particleIdealised model of a particle in physics
- Point sourceSingle, negligibly-sized object from which light, sound, energy, etc. emanates
- Poisson algebraIn mathematics, a Poisson algebra is an associative algebra together with a Lie bracket th
- Poisson bracketOperation in Hamiltonian mechanics
- Poisson's ratioMeasure of material deformation perpendicular to loading
- PolaritonQuasiparticles arising from EM wave coupling
- Polarization (waves)Property of waves that can oscillate with more than one orientation
- Polarization densityVector field describing the density of electric dipole moments in a dielectric material
- PolaronQuasiparticle in condensed matter physics
- Polyakov actionIn physics, the Polyakov action is an action of the two-dimensional conformal field theory
- Polyakov loopIn quantum field theory, the Polyakov loop is the thermal analogue of the Wilson loop, act
- Polymakepolymake is a software for the algorithmic treatment of convex polyhedra.
- Polymer physicsField of physics that studies polymers
- Polymer scienceSubfield of materials science concerned with polymers
- Polytropic processThermodynamic process
- Popper's experimentPopper's experiment is an experiment proposed by the philosopher Karl Popper to test aspec
- Position (geometry)Vector representing the position of a point with respect to a fixed origin
- Position and momentum spacesPhysical spaces representing position and momentum, Fourier-transform duals
- Position operatorOperator in quantum mechanics
- PositronAntiparticle of the electron
- Positron emissionType of radioactive decay
- PositroniumBound state of an electron and positron
- Post-Newtonian expansionIn general relativity, post-Newtonian expansions (PN expansions) are used for finding an a
- Postulates of special relativityConcept in physics
- Potassium silicateChemical compound
- PotentialCurrently unrealized ability
- Potential energyEnergy held by an object because of its position relative to other objects
- Potential energy surfaceFunction describing the energy of a physical system in terms of certain parameters
- Potential wellConcept in quantum mechanics
- Potts modelModel in statistical mechanics generalizing the Ising model
- Pound–Rebka experimentThe Pound–Rebka experiment monitored frequency shifts in gamma rays as they rose and fell
- Power (physics)Amount of energy transferred or converted per unit time
- Power factorRatio of active power to apparent power
- Power factor (shooting sports)Power factor (PF) in practical shooting competitions refers to a ranking system used to re
- Poynting vectorMeasure of directional electromagnetic energy flux
- Poynting's theoremTheorem in physics showing the conservation of energy for the electromagnetic field
- Pp-wave spacetimeConcept in general relativity
- Prabhu Lal BhatnagarIndian mathematician (1912–1976)
- Prandtl–Batchelor theoremIn fluid dynamics, Prandtl–Batchelor theorem states that if in a two-dimensional laminar f
- Prandtl–Meyer expansion fanA supersonic expansion fan, technically known as Prandtl–Meyer expansion fan, a two-dimens
- Praveen ChaudhariIndian American physicist (1937-2010)
- PrecessionPeriodic change in the direction of a rotation axis
- Precision glass mouldingProduction of optical glass without grinding and polishing
- PressureForce distributed over an area
- Pressure gradientSpace rate of variation of pressure in a given direction
- Pressure-gradient forceIn fluid mechanics, the pressure-gradient force is the force that results when there is a
- Pressure–volume diagramDiagram showing the relationship between pressure and volume in a system
- Primary colorFundamental color in color mixing
- Primordial black holeHypothetical black hole formed soon after the Big Bang
- Princeton Large TorusThe Princeton Large Torus (or PLT), was an early tokamak built at the Princeton Plasma Phy
- Princeton Plasma Physics LaboratoryLaboratory in Princeton, New Jersey, United States
- Principal quantum numberNumber assigned to each electron shell in an atom
- Principle of covariancePrinciple in relativity
- Principle of localityPhysical principle that only immediate surroundings can influence an object
- Principle of maximum entropyPrinciple in Bayesian statistics
- Principle of relativityPhysics principle
- Probability amplitudeComplex number whose squared absolute value is a probability
- Probe tipA probe tip is an instrument used in scanning probe microscopes (SPMs) to scan the surface
- Problem of timeConceptual conflict between general relativity and quantum mechanics
- Proca actionAction of a massive abelian gauge field
- ProjectileObject propelled through the air
- Projectile motionMotion of launched objects due to gravity
- Projector augmented wave methodSolid state physics calculation technique
- PropagatorFunction in quantum field theory showing probability amplitudes of moving particles
- Proper timeElapsed time between two events as measured by a clock that passes through both events
- Proportional counterThe proportional counter is a type of gaseous ionization detector device used to measure p
- Proportionality (mathematics)Property of two varying quantities with a constant ratio
- ProtonSubatomic particle with positive charge
- Proton decayHypothetical particle decay process of a proton
- Proton emissionType of radioactive decay
- Proton nuclear magnetic resonanceProton nuclear magnetic resonance (proton NMR, hydrogen-1 NMR, or 1H NMR) is the applicati
- Proton therapyMedical procedure
- ProtoniumBound state of a proton and antiprotron
- Pseudo-Riemannian manifoldDifferentiable manifold with nondegenerate metric tensor
- PseudovectorPhysical quantity that changes sign with improper rotation
- PSR J2007+2722PSR J2007+2722 is a 40.8-hertz isolated pulsar in the Vulpecula constellation, 5.3 kpc (17
- Pulsar timing arrayGravitational-wave astronomy technique
- Pulse (physics)Small disturbance moving through a physical medium
- Pulsed laserAny laser not classified as continuous-wave
- Pure 4D N = 1 supergravityIn supersymmetry, pure 4D supergravity describes the simplest four-dimensional supergravit
- PurpleRange of colors with the hues between blue and magenta
- PushchinoPushchino (Russian: Пущино, IPA: ) is a town in Moscow Oblast, Russia, an important scient
