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- A Brief History of Time1988 book by Stephen Hawking
- A Dynamical Theory of the Electromagnetic Field1865 physics paper by James Maxwell
- A Treatise on Electricity and Magnetism1873 books by James Clerk Maxwell
- A-weightingFrequency response curves used in sound pressure level measurement
- Ab initio methods (nuclear physics)In nuclear physics, ab initio methods seek to describe the atomic nucleus from the bottom
- Abbe sine conditionDesign rule for optical systems
- Aberration (astronomy)Phenomenon wherein objects appear to move about their true positions in the sky
- Aberration-corrected transmission electron microscopyAberration-corrected transmission electron microscopy (AC-TEM) is the general term for usi
- Abhay AshtekarIndian-American theoretical physicist
- Above-threshold ionizationIn atomic, molecular, and optical physics, above-threshold ionization (ATI) is a multi-pho
- Abraham BennetEnglish clergyman and physicist
- Abraham PaisDutch-American physicist and science historian
- Abraham–Lorentz forceRecoil force on accelerating charged particle
- Abrikosov vortexVortex of supercurrent within a type-II superconductor
- Absolute angular momentumIn meteorology, absolute angular momentum is the angular momentum in an 'absolute' coordin
- Absolute rotationRotation independent of any external reference
- Absolute space and timeTheoretical foundation of Newtonian mechanics
- Absolute zeroLowest theoretical temperature
- AbsorbanceLogarithm of ratio of incident to transmitted radiant power through a sample
- Absorption (acoustics)When an object takes in energy from sound waves instead of reflecting them
- Absorption (electromagnetic radiation)Physical process by which matter takes up a photon's energy and stores it
- Absorption bandRange on the electromagnetic spectrum
- Absorption cross sectionMmeasures the probability of an absorption process
- Absorption refrigeratorRefrigerator that uses a heat source
- AC motorElectric motor driven by an AC electrical input
- AC powerPower in alternating current systems
- AccelerationRate of change of velocity
- Accelerator mass spectrometryAccelerator that accelerates ions to high speeds before analysis
- Accelerator neutrinoAn accelerator neutrino is a human-generated neutrino or antineutrino obtained using parti
- Accelerator Neutrino Neutron Interaction ExperimentWater Cherenkov detector experiment
- Accelerator physicsPhysics related to the study, design, building and operation of particle accelerators
- AccelerometerDevice that measures proper acceleration
- Achromatic lensLens that is designed to limit the effects of chromatic and spherical aberration
- Acoustic attenuationIn acoustics, acoustic attenuation is a measure of the energy loss of sound propagation th
- Acoustic Doppler velocimetryMeasurement equipment
- Acoustic impedanceOpposition that a system presents to an acoustic pressure
- Acoustic paramagnetic resonanceAbsorption of sound by particles suspended in a magnetic field
- Acoustic resonanceResonance phenomena in sound and musical devices
- Acoustic theoryTheory of sound waves
- Acoustic waveType of energy propagation
- Acoustic wave equationEquation for the propagation of sound waves through a medium
- Acoustic waveguidePhysical structure for guiding sound waves
- AcousticsBranch of physics involving mechanical waves
- Acousto-opticsStudy of interactions between sound and light
- Acoustoelastic effectThe acoustoelastic effect is how the sound velocities (both longitudinal and shear wave ve
- AcrylateAcrylates (IUPAC: prop-2-enoates) are the salts, esters, and conjugate bases of acrylic ac
- Acrylate polymerGroup of polymers prepared from acrylate monomers
- Acta CrystallographicaScientific journal series on crystallography
- Acta Crystallographica Section AAcademic journal
- Acta Crystallographica Section BAcademic journal
- Acta Crystallographica Section DActa Crystallographica Section D: Structural Biology publishes articles covering all areas
- Action (physics)Physical quantity of dimension energy × time
- Action at a distanceConcept in physics
- Action principlesFundamental mechanical principles
- Activation productMaterials made radioactive by neutron activation
- Active and passive transformationDistinction between meanings of Euclidean space transformations
- Active laser mediumSource of optical gain in a laser
- Adaptive feedback cancellationMethod of cancelling audio feedback
- AdhesionMolecular property
- Adiabatic connection fluctuation dissipation theoremQuantum-mechanical simulation framework
- Adiabatic flame temperatureIn the study of combustion, the adiabatic flame temperature is the temperature reached by
- Adiabatic processThermodynamic process in which no mass or heat is exchanged with surroundings
- Adiabatic theoremConcept in quantum mechanics
- Adinkra symbols (physics)In supergravity and supersymmetric representation theory, Adinkra symbols are a graphical
- AdlershofAdlershof (German: , literally "Eagle's Court") is a locality (Ortsteil) in the borough (B
- ADM formalismHamiltonian formulation of general relativity
- AdmittanceEase of electrical current flow
- Adobe RGB color spaceColor space developed by Adobe
- Adolf BusemannGerman-American aerospace engineer
- AdS/CFT correspondenceDuality between theories of gravity on anti-de Sitter space and conformal field theories
- AdS/QCD correspondenceCorrespondence between anti-de Sitter space and quantum chromodynamics
- Advanced Light SourceSynchrotron radiation facility
- Advanced Photon SourceParticle accelerator
- Advanced Test ReactorThe Advanced Test Reactor (ATR) is a research reactor at the Idaho National Laboratory, lo
- Advances in PhysicsAcademic journal
- Advection upstream splitting methodThe Advection Upstream Splitting Method (AUSM) is a numerical method used to solve the adv
- Aephraim M. SteinbergAephraim M. Steinberg is a professor at the University of Toronto and founding member of t
- Aerodynamic forceIn fluid mechanics, an aerodynamic force is a force exerted on a body by the air (or other
- Aerodynamic potential-flow codeIn fluid dynamics, aerodynamic potential flow codes or panel codes are used to determine t
- AerodynamicsBranch of dynamics concerned with studying the motion of air
- Aérospatiale SA 315B LamaUtility helicopter
- AerostaticsA subfield of fluid statics, aerostatics is the study of gases that are not in motion with
- Aether drag hypothesisEarly attempt to explain constant speed of light
- Aether theoriesSet of theories
- Aharonov–Bohm effectElectromagnetic quantum-mechanical effect in regions of zero magnetic and electric field
- Aharonov–Casher effectThe Aharonov–Casher effect is a quantum mechanical phenomenon predicted in 1984 by Yakir A
- Aimé CottonFrench physicist (1869–1951)
- AIP styleManual of Style by AIP
- Air compressorMachine to pressurize air
- Aircraft dynamic modesTypes of aircraft behavior
- Aircraft flight mechanicsPhysics of heavier than air aircraft
- Aircraft gross weightTotal aircraft weight during flight or ground operation
- Airlift pumpPump using density difference due to injected air in the liquid
- Airy diskDiffraction pattern in optics
- Airy wave theoryFluid dynamics theory on gravity waves
- Akira HasegawaJapanese theoretical physicist (1934–2025)
- Alain AspectFrench physicist (born 1947)
- Alan CottrellBritish metallurgist and physicist
- Alan J. HeegerAmerican physicist and chemist (born 1936)
- Alan M. PortisAlan Mark Portis (July 17, 1926 – September 6, 2010) was an American solid-state physicist
- Alastair G. W. CameronCanadian astrophysicist (1925–2005)
- ALBA (synchrotron)Particle accelerator in Catalonia, Spain
- Aleksandr AkhiezerAleksandr (Oleksandr) Ilyich Akhiezer (Ukrainian: Олекса́ндр Іллі́ч Ахіє́зер, Russian: Але
- Aleksandr Aleksandrov (mathematician)Russian mathematician (1912–1999)
- Aleksandr Yevgenievich ChudakovRussian physicist (1921–2001)
- ALEPH experimentALEPH was a particle detector at the Large Electron-Positron collider (LEP) at CERN. It wa
- Alessandra BuonannoItalian-American physicist
- Alexander AndreevRussian theoretical physicist (1939–2023)
- Alexander DalgarnoBritish physicist and father of molecular astrophysics
- Alexander Davydov (physicist)Soviet Ukrainian physicist (1912–1993)
- Alexander MacfarlaneAlexander Macfarlane FRSE LLD (21 April 1851 – 28 August 1913) was a Scottish logician, ph
- Alexander Polyakov (physicist)Russian theoretical physicist
- Alexander ZamolodchikovRussian physicist
- Alexandru ProcaRomanian physicist (1897–1955)
- Alexey AnselmRussian theoretical physicist (1934–1998)
- Alexis ClairautFrench mathematician, astronomer, and geophysicist (1713–1765)
- Alexis Thérèse PetitAlexis Thérèse Petit (French: ; 2 October 1791 – 21 June 1820) was a French physicist.
- Alf AdamsBritish physicist
- Alfred BuchererGerman physicist
- Alfvén waveLow-frequency plasma wave
- Algebraic quantum field theoryAxiomatic approach to quantum field theory
- ALICE (accelerator)53°20′35″N 02°38′26″W / 53.34306°N 2.64056°W
- Allan MacLeod CormackSouth African and American physicist
- Allan V. CoxAmerican geophysicist (1926–1987)
- AlnicoFamily of iron alloys
- AlphaFirst letter of the Greek alphabet
- Alpha decayType of radioactive decay
- ALPHA experimentThe Antihydrogen Laser Physics Apparatus (ALPHA), also known as AD-5, is an experiment at
- Alpha Magnetic SpectrometerParticle detector on the International Space Station
- Alpha particleIonizing radiation particle of two protons and two neutrons
- AltermagnetismType of magnetic state
- Alternating currentElectric current that periodically reverses direction
- Alternating Gradient SynchrotronParticle accelerator at Brookhaven National Laboratory
- Alternative stress measuresIn continuum mechanics, the most commonly used measure of stress is the Cauchy stress tens
- Amagat's lawGas law describing volume of a gas mixture
- Amber (color)Color midway between yellow and orange
- Ambient noise levelBackground sound pressure level
- Ambient pressurePressure of the surrounding medium
- American Association of Physics TeachersPhysics organization
- American Ceramic SocietyProfessional organization
- American Geophysical UnionNonprofit organization of geophysicists
- American Institute of PhysicsAmerican non-profit organization
- American Physical SocietyOrganization of physicists
- AmmeterDevice that measures electric current
- Amontons (crater)Amontons is a tiny lunar impact crater in the western half of the Mare Fecunditatis. It is
- Amorphous solidNon-crystalline solid
- Ampère's circuital lawConcept in classical electromagnetism
- Ampère's force lawPhysical law
- Amphidromic pointLocation at which there is little or no tide
- Amplified spontaneous emissionType of light that can be emitted by an optical amplifier
- AmplitudeMeasure of change in a periodic variable
- AmplituhedronGeometric structure used in certain particle interactions
- An Essay on the Application of Mathematical Analysis to the Theories of Electricity and Magnetism1828 essay by George Green
- An Exceptionally Simple Theory of EverythingFringe theory of physics
- An Inquiry Concerning the Source of the Heat Which Is Excited by Friction1798 scientific paper by Benjamin Thompson
- An Introduction to MechanicsUndergraduate textbook
- Analytical mechanicsOverview of mechanics based on the least action principle
- Anatoly Alexandrov (physicist)Russian physicist (1903–1994)
- Anchor HockingManufacturer of glassware
- Anderson impurity modelHamiltonian used in quantum physics
- Anderson localizationAbsence of diffusion waves in disordered media
- André BlondelFrench engineer and physicist (1863–1938)
- Andreas AcrivosGreek–American physicist (1928–2025)
- Andrei LindeRussian-American theoretical physicist
- Andrei ZelevinskyAndrei Vladlenovich Zelevinsky (Андрей Владленович Зелевинский; 30 January 1953 – 10 April
- Andrew FreethHubert Andrew Freeth RA (29 December 1912 – 26 March 1986) was a British portrait painter
- Andrew Gemant AwardAnnual Physics Award
- Andrew J. HansonAmerican theoretical physicist and computer scientist
- Andrew StromingerAmerican physicist
- Andrzej BurasDanish physicist
- AnemometerInstrument for measuring wind speed
- Angioletta CoradiniItalian astrophysicist and planetary scientist
- Angle of incidence (optics)Angle in geometric optics
- Angle of reposeSteepest angle at which granular materials can be piled before slumping
- Angle-resolved photoemission spectroscopyExperimental technique to determine the distribution of electrons in solids
- Anglican prayer beadsAnglican prayer beads, also known as the Anglican rosary or Anglican chaplet, are a loop o
- Anglo-Saxon glassAnglo-Saxon glass has been found across England during archaeological excavations of both
- Angular accelerationPhysical quantity
- Angular displacementDisplacement measured angle-wise when a body is showing circular or rotational motion
- Angular frequencyRate of change of angle
- Angular momentumConserved physical quantity; rotational analogue of linear momentum
- Angular momentum couplingCoupling in quantum physics
- Angular momentum of lightPhysical quantity carried in photons
- Angular momentum operatorQuantum mechanical operator related to rotational symmetry
- Angular spectrum methodThe angular spectrum method is a technique for modeling the propagation of a wave field. T
- Angular velocityDirection and rate of rotation
- Angular velocity tensorThe angular velocity tensor is a skew-symmetric matrix defined by:
- AnharmonicityIn classical mechanics, anharmonicity is the deviation of a system from being a harmonic o
- AnisotropyIn geometry, property of being directionally dependent
- Annalen der PhysikAcademic journal
- Annales Henri PoincaréAcademic journal
- Anne L'HuillierFrench-Swedish Nobel laureate physicist (born 1958)
- Annealing (glass)Process for relieving stress in manufactured glass
- AnnihilationCollision of a particle and its antiparticle
- Annual Review of Fluid MechanicsAcademic journal
- Annus mirabilisLatin phrase referring to several years during which events of major importance occurred
- Annus mirabilis papersPublished papers of Albert Einstein in 1905
- Anode rayBeam of positively charged ions
- Anomalous diffusionAnomalous diffusion is a diffusion process with a non-linear relationship between the mean
- Anomalous magnetic dipole momentValue in quantum electrodynamics
- Anomaly (physics)Asymmetry of classical and quantum action
- Anselmus de BoodtBelgian physician and gemologist
- Ant colony optimization algorithmsOptimization algorithm
- Antarctic Impulsive Transient AntennaExperiment to study ultra-high-energy cosmic neutrinos
- ANTARES (telescope)Neutrino Detector
- Anti-gravityPhysical and science fiction concept
- Anti-symmetric operatorRaising and lowering operators
- Antibiotic properties of nanoparticlesNanoparticles have been studied extensively for their antimicrobial properties in order to
- AntiferromagnetismRegular pattern of magnetic moment ordering
- AntihydrogenExotic particle made of an antiproton and positron
- AntimatterMaterial composed of antiparticles
- Antimatter tests of Lorentz violationExperiments testing the fundamental assumptions of physics
- Antimatter weaponTheoretical weapon using antimatter
- AntineutronSubatomic particle
- AntiparticleParticle with opposite charges
- AntiprotonSubatomic particle
- Antiproton DeceleratorParticle storage ring at CERN, Switzerland
- Antiprotonic heliumExotic matter with an antiproton in place of an electron
- Antiquarian science booksOriginal historical works on science and technology
- AntiresonanceFrequencies in coupled oscillators
- Antistatic agentCompound used to reduce or eliminate buildup of static electricity
- Antistatic deviceAn antistatic device is any device that reduces, dampens, or otherwise inhibits electrosta
- Antisymmetric tensorIn mathematics and theoretical physics, a tensor is antisymmetric on (or with respect to)
- Antoine César BecquerelFrench scientist (1788–1878)
- Antoine de ChézyFrench physicist and engineer (1718–1798)
- Anton ZeilingerAustrian quantum physicist (born 1945)
- Antonio Neri (chemist)Italian chemist (1576–1614)
- AnyonType of two-dimensional quasiparticle
- Apache Point Observatory Lunar Laser-ranging OperationThe Apache Point Observatory Lunar Laser-ranging Operation, or APOLLO, is a project at the
- Apache tearsPopular term for pebbles of obsidian
- Aperiodic crystalCrystal type lacking 3D periodicity
- ApertureHole or opening through which light travels
- Apparent horizonAlternative of event horizon first suggested by Stephen Hawking
- Appell's equation of motionFormulation of classical mechanics
- Appleton–Hartree equationMathematical expression
- Application of silicon-germanium thermoelectrics in space explorationSilicon-germanium (SiGe) thermoelectrics have been used for converting heat into electrica
- Applications of nanotechnologyUses for technology on very small scales
- Applications of quantum mechanicsTheories, models and concepts that go back to the quantum hypothesis of Max Planck
- Applied Physics AAcademic journal
- Applied spectroscopyUse of spectroscopy to investigate and solve problems
- Apsidal precessionRotation of a celestial body's orbital line of apsides
- AQUALAQUAL is a theory of gravity based on Modified Newtonian Dynamics (MOND), but using a Lagr
- Arc suppressionArc suppression is the reduction of the electric arc energy that occurs when current-carry
- Arc weldingWelding process
- ArchaeoacousticsStudy of sound and its relation to ancient things
- Archimedean groupIn abstract algebra, a branch of mathematics, an Archimedean group is a linearly ordered g
- Archimedean propertyMathematical property of algebraic structures
- Archimedes' principleBuoyancy principle in fluid dynamics
- Architectural glassBuilding material
- Area densityMass per unit area
- Argonne National LaboratoryResearch laboratory in Illinois, US
- ARGUS (experiment)ARGUS (A Russian-German-United States-Swedish Collaboration; later joined by Canada and th
- ARGUS distributionIn physics, the ARGUS distribution, named after the particle physics experiment ARGUS, is
- Argus laserInfrared laser
- Aristid von GrosseAristid von Grosse (January 1905 – July 21, 1985) was a German nuclear chemist. During his
- Aristotelian physicsNatural sciences as described by Aristotle
- Arkady BrishSoviet physicist
- Arrow information paradoxThe Arrow information paradox (information paradox for short, or AIP), and occasionally re
- Arrow of timeConcept in physics of one-way time
- Art Nouveau glassArt Nouveau glass is fine glass in the Art Nouveau style. Typically the forms are undulati
- Artem AlikhanianSoviet physicist (1908-1978)
- Arterial spin labellingArterial spin labeling (ASL), also known as arterial spin tagging, is a magnetic resonance
- Arthur CovingtonCanadian physicist (1913–2001)
- Arthur Jeffrey DempsterCanadian-American physicist (1886–1950)
- Arthur W. ConwayArthur William Conway FRS PRIA (2 October 1875 – 11 July 1950) was a distinguished Irish m
- Artur EkertBritish-Polish physicist (born 1961)
- ArXivOnline archive of e-prints
- ASDEX UpgradeASDEX Upgrade (Axially Symmetric Divertor Experiment) is a divertor tokamak at the Max-Pla
- Asimina ArvanitakiGreek physicist
- Aspect's experimentQuantum mechanics experiment
- AssergiAssergi is a frazione of the comune of L'Aquila, located about 11 km (6.8 mi) from the cap
- Astigmatism (optical systems)Optical aberration
- ASTRA (reactor)ASTRA (Adaptierter Schwimmbecken-Typ-Reaktor Austria, English translation: Adapted swimmin
- Astro Space Center (Russia)This enclave of scientific research is officially known as Astro Space Center of PN Lebede
- Astroparticle and Cosmology LaboratoryThe Astroparticle and Cosmology (APC) laboratory in Paris gathers researchers (experimenta
- Astroparticle physicsBranch of particle physics
- AsymmetryAbsence of, or a violation of, symmetry
- Asymptotic freedomProperty of gauge theories in particle physics
- Asymptotic homogenizationMethod of studying partial differential equations
- Asymptotically flat spacetimeLorentzian manifold where curvature vanishes at large distances
- ATHENA experimentATHENA, also known as the AD-1 experiment, was an antimatter research project at the Antip
- ATLAS experimentCERN LHC experiment
- Atmospheric diffractionWave Phenomenon
- Atmospheric opticsOptical characteristics of the atmosphere
- Atmospheric physicsSub-field of physics dealing with the atmosphere's structure, composition, and motion
- Atmospheric radiative transfer codesCalculation of radiative transfer of atmospheric electromagnetic radiation
- Atmospheric refractionDeviation of light as it moves through the atmosphere
- Atmospheric thermodynamicsStudy of heat-to-work transformations and their reverse
- Atmospheric windowRange of EM wavelengths that can pass through Earth's atmosphere
- AtomSmallest unit of a chemical element
- Atom opticsTechniques to exploit wave properties of atoms
- Atom probeField ion microscope coupled with a mass spectrometer
- Atomic electron transitionChange of an electron between energy levels within an atom
- Atomic Energy Research EstablishmentFormer UK nuclear power research and development site
- Atomic force microscopyType of very-high-resolution microscopy
- Atomic form factorMeasure of the scattering amplitude of a wave by an isolated atom
- Atomic manipulationAtomic manipulation is the process of moving single atoms on a substrate using a scanning
- Atomic mirrorIn physics, an atomic mirror is a device which reflects neutral atoms in a way similar to
- Atomic nucleusCore of an atom composed of nucleons
- Atomic orbitalFunction describing an electron in an atom
- Atomic packing factorCrystallography concept
- Atomic physicsField of physics that studies the atom
- Atomic, molecular, and optical physicsStudy of matter-light interactions at small scales
- Attenuated total reflectanceAttenuated total reflection (ATR) is a sampling technique used in conjunction with infrare
- AttenuationGradual loss of flux intensity through a medium
- Attenuation coefficientLight or sound absorption in a substance
- Attosecond physicsStudy of physics on quintillionth-second timescales
- Atwood machineClassroom demonstration used to illustrate principles of classical mechanics
- Audio frequencySound whose frequency is audible to the average human
- Audio system measurementsMeans of quantifying system performance
- Auditory maskingWhen perception of one sound is affected by another sound
- Auger effectPhysical phenomenon
- Auger electron spectroscopyAnalytical technique used specifically in the study of surfaces
- August BeerAugust Beer (German: ; 31 July 1825 – 18 November 1863) was a German physicist, chemist, a
- Auguste BravaisFrench physicist
- Augusto SagnottiItalian theoretical physicist
- Auroral chorusGeomagnetic phenomenon
- Australasian strewnfieldStrewnfield containing most of Australasia
- Australian SynchrotronLarge-scale synchrotron facility in Australia
- AutopoiesisSystem capable of producing itself
- AutorotationRotation of helicopter rotors by action of wind resistance rather than engine power
- Avalanche breakdownElectrical phenomenon
- Avogadro's lawRelationship between volume and amount of a gas at constant temperature and pressure
- Avoided crossingQuantum physics and chemistry phenomenon
- AxionHypothetical elementary particle
- Azimuthal quantum numberQuantum number denoting orbital angular momentum
- Azure (color)Bright, cyan-blue colour
