# Index of physics articles (A)

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.

## Index of physics articles

* 0–9
* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z

## A

* A. Baha Balantekin
* A. Carl Helmholz
* A. Catrina Bryce
* A. E. Becquerel
* A. G. Doroshkevich
* A. I. Shlyakhter
* A. K. Jonscher
* A. P. Balachandran
* A15 phases
* AAS 215th meeting
* ABINIT
* ACE (CERN)
* ACS Nano
* AD1 experiment
* AD2 experiment
* AD3 experiment
* AD4 experiment
* AD5 experiment
* AD6 experiment
* ADA collider
* ADHM construction
* ADITYA (tokamak)
* ADM energy
* ADM formalism
* ADONE
* Advanced Simulation Library
* AEGIS (particle physics)
* AIDA (computing)
* AILU
* AIP Conference Proceedings
* AKLT Model
* ALBA (synchrotron)
* ALEPH experiment
* ALICE (accelerator)
* ALPHA Collaboration
* AMBER
* AMOLF
* ANNNI model
* ANTARES (accelerator)
* ANTARES (telescope)
* APEXC
* ARC-ECRIS
* ARGUS (experiment)
* ARGUS distribution
* ARROW waveguide
* ASACUSA
* ASA Gold Medal
* ASA Silver Medal
* ASDEX Upgrade
* ASTM Subcommittee E20.02 on Radiation Thermometry
* ASTRA (reactor)
* ASTRID 2
* ATHENA
* ATLAS Collaboration
* ATLAS experiment
* ATOMKI
* ATRAP
* AUSM
* A Brief History of Time
* A Briefer History of Time (Hawking and Mlodinow book)
* A Different Universe
* A Dynamical Theory of the Electromagnetic Field
* A Large Ion Collider Experiment
* A New Theory of Magnetic Storms
* A Treatise on Electricity and Magnetism
* A Universe from Nothing
* A dynamical theory of the electromagnetic field
* Aage Bohr
* Aaldert Wapstra
* Aaron Klug
* Aaron Lemonick
* Abbe prism
* Abbe sine condition
* Abdel-Moniem El-Ganayni
* Abdul Qadeer Khan
* Abdul Rasul (Iraqi scientist)
* Abdullah Sadiq
* Abdus Salam
* Abeles matrix formalism
* Abell 520
* Aberdeen Tunnel Underground Laboratory
* Aberration of light
* Abhay Ashtekar
* Ablation
* Abner Shimony
* Abol-fath Khazeni
* About Time (book)
* Above threshold ionization
* Abraham (Avi) Loeb
* Abraham Alikhanov
* Abraham Bennet
* Abraham Esau
* Abraham Haskel Taub
* Abraham Katzir
* Abraham Pais
* Abraham Zelmanov
* Abraham–Lorentz force
* Abraham–Lorentz–Dirac force
* Abraham–Minkowski controversy
* Abram Ioffe
* Abrikosov vortex
* Absolute angular momentum
* Absolute dating
* Absolute horizon
* Absolute magnitude
* Absolute rotation
* Absolute theory
* Absolute threshold of hearing
* Absolute time and space
* Absolute zero
* Absorbed dose
* Absorber
* Absorption (acoustics)
* Absorption (electromagnetic radiation)
* Absorption band
* Absorption cross section
* Absorption curve
* Absorption edge
* Absorption refrigerator
* Absorption spectroscopy
* Absorption spectrum
* Abu'l-Barakāt al-Baghdādī
* Abundance of the chemical elements
* Accelerated reference frame
* Accelerating expansion of the universe
* Accelerating universe
* Acceleration
* Acceleration voltage
* Accelerator Test Facility (Japan)
* Accelerator Test Facility (New York)
* Accelerator mass spectrometry
* Accelerator physics
* Accelerometer
* Acceleron
* Acceptor (semiconductors)
* Accidental symmetry
* Accordion effect
* Accretion (astrophysics)
* Accretion disc
* Acentric factor
* Achim Richter
* Acicular ferrite
* Acoplanarity
* Acoustic Doppler Current Profiler
* Acoustic Doppler velocimetry
* Acoustic analogy
* Acoustic approximation
* Acoustic attenuation
* Acoustic cleaning
* Acoustic cloak
* Acoustic contrast factor
* Acoustic dispersion
* Acoustic droplet ejection
* Acoustic emission
* Acoustic holography
* Acoustic impedance
* Acoustic interferometer
* Acoustic levitation
* Acoustic location
* Acoustic lubrication
* Acoustic metamaterials
* Acoustic metric
* Acoustic microscopy
* Acoustic mirror
* Acoustic network
* Acoustic ohm
* Acoustic paramagnetic resonance
* Acoustic quieting
* Acoustic radiation force
* Acoustic radiation force impulse imaging
* Acoustic radiation pressure
* Acoustic resonance
* Acoustic rheometer
* Acoustic signature
* Acoustic source localization
* Acoustic streaming
* Acoustic suspension
* Acoustic theory
* Acoustic wave
* Acoustic wave equation
* Acoustical Society of America
* Acoustical engineering
* Acoustical measurements and instrumentation
* Acoustical oceanography
* Acoustics
* Acousto-optic deflector
* Acousto-optics
* Acta Biochimica et Biophysica Sinica
* Acta Biomaterialia
* Acta Crystallographica
* Acta Crystallographica A
* Acta Crystallographica B
* Acta Crystallographica C
* Acta Crystallographica D
* Acta Crystallographica E
* Acta Crystallographica F
* Acta Materialia
* Acta Physica Polonica
* Acta Physica Polonica A
* Acta Physica Polonica B
* Actinic light
* Actinide
* Actinides in the environment
* Actinism
* Actinometer
* Action-angle coordinates
* Action (physics)
* Action at a distance (physics)
* Activation analysis
* Activation product
* Active and passive transformation
* Active cavity radiometer
* Active galactic nucleus
* Active laser medium
* AdS/CFT correspondence
* AdS/QCD
* AdS black hole
* Ad Lagendijk
* Adam Dziewonski
* Adam Falk
* Adam Riess
* Adaptive compliant wing
* Adaptive feedback cancellation
* Adaptive optics
* Added mass
* Additive white Gaussian noise
* Adelbert Ames, Jr.
* Adhémar Jean Claude Barré de Saint-Venant
* Adi Bulsara
* Adiabatic conductivity
* Adiabatic flame temperature
* Adiabatic invariant
* Adiabatic principle
* Adiabatic process
* Adiabatic process (quantum mechanics)
* Adiabatic shear band
* Adiabatic theorem
* Adinkra symbols (physics)
* Adjustable Ranging Telescope
* Adlène Hicheur
* Admittance
* Adolf Bestelmeyer
* Adolf Busemann
* Adolf Eugen Fick
* Adolf Kratzer
* Adolfo Bartoli
* Adriaan Fokker
* Adrian Bejan
* Adrian Berry, 4th Viscount Camrose
* Adriano de Paiva
* Adrien-Marie Legendre
* Advanced Composite Materials (journal)
* Advanced Light Source
* Advanced Photon Source
* Advanced Spaceborne Thermal Emission and Reflection Radiometer
* Advanced Thin Ionization Calorimeter
* Advanced boiling water reactor
* Advanced composite materials (science & engineering)
* Advances in Applied Clifford Algebras
* Advances in Physics
* Advances in Space Research
* Advances in Theoretical and Mathematical Physics
* Advection
* Adverse pressure gradient
* Adverse yaw
* Ady Stern
* Aeolipile
* Aeroacoustics
* Aerobraking
* Aerocapture
* Aerodynamic center
* Aerodynamic diameter
* Aerodynamic drag
* Aerodynamic force
* Aerodynamic heating
* Aerodynamic levitation
* Aerodynamic potential flow code
* Aerodynamics
* Aeroelasticity
* Aerogel
* Aerographite
* Aerogravity assist
* Aerology
* Aeromechanics
* Aeronautics
* Aeroprediction
* Aerosol
* Aerosol impaction
* Aerostatics
* Aether (classical element)
* Aether drag hypothesis
* Aether theories
* Affleck–Dine mechanism
* Afshar experiment
* Afterglow plasma
* Age crisis
* Age of the Earth
* Age of the universe
* Aggregated diamond nanorod
* Agitator (device)
* Agnes Pockels
* Agrophysics
* Aharon Katzir
* Aharonov–Bohm effect
* Ahmet Yıldız
* Aichelburg–Sexl ultraboost
* Aileron
* Aimé Argand
* Aimé Cotton
* Air-mixing plenum
* Air (classical element)
* Air conditioning
* Air flow bench
* Air knife
* Air separation
* Air shower (physics)
* Air track
* Airborne wind turbine
* Aircraft dynamic modes
* Aircraft flight mechanics
* Aircraft noise
* Airfoil
* Airlift pump
* Airy beam
* Airy disk
* Airy wave theory
* Ajoy Ghatak
* Akeno Giant Air Shower Array
* Akitsune Imamura
* Akoustolith
* Al-Khazini
* Alain Aspect
* Alain Haché
* Alan Astbury
* Alan Boss
* Alan West Brewer
* Alan Cook
* Alan Cottrell
* Alan Guth
* Alan J. Heeger
* Alan Kostelecký
* Alan Lightman
* Alan Lloyd Hodgkin
* Alan M. Portis
* Alan Nunn May
* Alan Sokal
* Alan Tower Waterman
* Alan Walsh (physicist)
* Alastair G. W. Cameron
* Albedo
* Albert-László Barabási
* Albert Abraham Michelson
* Albert Baez
* Albert Allen Bartlett
* Albert Beaumont Wood
* Albert Betz
* Albert Bouwers
* Albert C. Geyser
* Albert Einstein
* Albert Einstein: Creator and Rebel
* Albert Einstein: The Practical Bohemian
* Albert Einstein Award
* Albert Einstein Medal
* Albert Einstein Science Park
* Albert Einstein World Award of Science
* Albert Einstein in popular culture
* Albert Fert
* Albert G. Hill
* Albert Messiah
* Albert Overhauser
* Albert Percival Rowe
* Albert Polman
* Albert Potter Wills
* Albert Rose (physicist)
* Albert Sauveur
* Albert Tarantola
* Albert Victor Bäcklund
* Albert von Ettingshausen
* Albrecht Fölsing
* Albrecht Unsöld
* Alcator C-Mod
* Alcubierre drive
* Aldert van der Ziel
* Alec Merrison
* Alejandro Corichi
* Aleksandar Despić
* Aleksandar Just
* Aleksander Akhiezer
* Aleksander Jabłoński
* Aleksander Zawadzki (naturalist)
* Aleksandr Andronov
* Aleksandr Chudakov
* Aleksandr Danilovich Aleksandrov
* Aleksandr Gurevich
* Aleksandr Leipunskii
* Aleksandr Stoletov
* Aleksei Pogorelov
* Aleksei Zinovyevich Petrov
* Alenush Terian
* Aleph (CERN)
* Alessandra Buonanno
* Alessandro Vaciago
* Alessandro Vespignani
* Alessandro Volta
* Alex Grossmann
* Alex Smith (engineer)
* Alex Stokes
* Alex Zettl
* Alex Zunger
* Alexander's band
* Alexander Akimov
* Alexander Alexeyevich Makarov
* Alexander Anderson (physicist)
* Alexander Animalu
* Alexander Balankin
* Alexander Behm
* Alexander Belavin
* Alexander Boksenberg
* Alexander Dalgarno
* Alexander Dallas Bache
* Alexander Davydov
* Alexander Eugen Conrady
* Alexander Fetter
* Alexander Friedmann
* Alexander Graham Bell
* Alexander Hollaender
* Alexander Hollaender Award in Biophysics
* Alexander Kuzemsky
* Alexander MacAulay
* Alexander Macfarlane
* Alexander Markovich Polyakov
* Alexander Meissner
* Alexander Mikhajlovich Baldin
* Alexander Nikuradse
* Alexander Patashinski
* Alexander Prokhorov
* Alexander R. Hamilton
* Alexander Rich
* Alexander S. Potupa
* Alexander Shikov
* Alexander Stepanovich Popov
* Alexander Vilenkin
* Alexander William Bickerton
* Alexander Zamolodchikov
* Alexander van Oudenaarden
* Alexandre Chorin
* Alexandru Marin (physicist)
* Alexandru Proca
* Alexei Alexeyevich Abrikosov
* Alexei Yuryevich Smirnov
* Alexei Zamolodchikov
* Alexey Andreevich Anselm
* Alexey Kavokin
* Alexis-Marie de Rochon
* Alexis Clairaut
* Alexis Thérèse Petit
* Alf Adams
* Alfons Bühl
* Alfred-Marie Liénard
* Alfred Barnard Basset
* Alfred Bucherer
* Alfred Hubler
* Alfred Kastler
* Alfred Kleiner
* Alfred Landé
* Alfred Lauck Parson
* Alfred M. Mayer
* Alfred O. C. Nier
* Alfred Perot
* Alfred Robb
* Alfred Saupe
* Alfred Schild
* Alfred Wegener
* Alfred Wilm
* Alfvén-Klein model
* Alfvén wave
* Algebra of physical space
* Algebraic holography
* Algodoo
* AliEn (ALICE Environment)
* Ali Javan
* Ali Moustafa Mosharafa
* Alice Leigh-Smith
* Alkali-metal thermal to electric converter
* All-Union Institute for Scientific and Technical Information
* All-silica fiber
* All gas-phase iodine laser
* Allais effect
* Allan Blaer
* Allan Boardman
* Allan Carswell
* Allan Mackintosh
* Allan McLeod Cormack
* Allan V. Cox
* Allen Shenstone
* Allyn Vine
* Allyne L. Merrill
* Aloyzas Sakalas
* Alpha-particle spectroscopy
* Alpha & Omega (book)
* Alpha Magnetic Spectrometer
* Alpha decay
* Alpha factor
* Alpha particle
* Alpha process
* Alpher–Bethe–Gamow paper
* Alternating Gradient Synchrotron
* Alternatives to general relativity
* Alternatives to the Standard Model Higgs
* Aluminium gallium phosphide
* Alv Egeland
* Alvarez Physics Memo
* Alvarez Physics Memos
* Alvin Andreas Herborg Nielsen
* Alvin C. Graves
* Alvin M. Weinberg
* Alvin Radkowsky
* Alwyn Van der Merwe
* Amagat
* Amagat's law
* Amal Kumar Raychaudhuri
* Amasa Stone Bishop
* Ambient noise level
* Ambient pressure
* Ambipolar diffusion
* Amer Iqbal
* American Association of Physicists in Medicine
* American Association of Physics Teachers
* American Astron. Soc. 215th Meeting
* American Astron. Soc. Meeting
* American Astron Soc 215th Meeting
* American Astronomical Society
* American Astronomical Society 215th meeting
* American Geophysical Union
* American Institute of Physics
* American Journal of Physics
* American Physical Society
* American Prometheus
* American Vacuum Society
* Ames Laboratory
* Ames trapezoid
* Amikam Aharoni
* Amir Caldeira
* Ammonium diuranate
* Ammonium uranyl carbonate
* Amorphous ice
* Amorphous metal
* Amorphous solid
* Amory Lovins
* Amos Ori
* Amos de-Shalit
* Amott test
* Amount of substance
* Ampere
* Ampere-turn
* Ampere model of magnetization
* Amphidromic point
* Amplified spontaneous emission
* Amplitude
* Amplitude damping channel
* Ampère's circuital law
* Ampère's force law
* Amrom Harry Katz
* Amsterdam Density Functional
* An Album of Fluid Motion
* An Elementary Treatise on Electricity
* An Essay on the Application of Mathematical Analysis to the Theories of Electricity and Magnetism
* An Exceptionally Simple Theory of Everything
* An Experimental Enquiry Concerning the Source of the Heat which is Excited by Friction
* Ana María Cetto
* Anales de Física
* Analog Integrated Circuits and Signal Processing
* Analog models of gravity
* Analysis of flows
* Analytical dynamics
* Analytical mechanics
* Anastigmat
* Anatol Roshko
* Anatole Abragam
* Anatole Boris Volkov
* Anatoli Blagonravov
* Anatoly Dyatlov
* Anatoly Larkin
* Anatoly Petrovich Alexandrov
* Anatoly Vlasov
* Anatoly Zhabotinsky
* Anaxagoras
* Anaximander
* Anders Boserup
* Anders Flodström
* Anders Johan Lexell
* Anders Jonas Ångström
* Anders Karlsson (physicist)
* Anders Knutsson Ångström
* Anderson's rule
* Anderson impurity model
* Anderson localization
* Anderson orthogonality theorem
* Andre Geim
* Andrea Alù
* Andrea M. Ghez
* Andrea Naccari
* Andrea Prosperetti
* Andreas Acrivos
* Andreas Albrecht (cosmologist)
* Andreas Gerasimos Michalitsianos
* Andreas Jaszlinszky
* Andreas Mershin
* Andreas Winter
* Andreas von Ettingshausen
* Andreev reflection
* Andrei Linde
* Andrei Sakharov
* Andrej Čadež
* Andrew E. Lange
* Andrew Gordon (Benedictine)
* Andrew Gray (physicist)
* Andrew Huxley
* Andrew J. Feustel
* Andrew Keller
* Andrew Lang (physicist)
* Andrew Lowe
* Andrew Lyne
* Andrew R. Liddle
* Andrew Steane
* Andrew Strominger
* Andrew Turberfield
* Andrey Kolmogorov
* Andreyev Acoustics Institute
* Andrija Mohorovičić
* Andrius Baltuška
* Andromeda–Milky Way collision
* Andrzej Kajetan Wróblewski
* Andrzej Sołtan
* Andrzej Trautman
* André-Marie Ampère
* André Blondel
* André Guinier
* André Lichnerowicz
* André Maréchal
* André Neveu
* André Pochan
* Anechoic chamber
* Aneesur Rahman
* Anello Di Accumulazione
* Anemometer
* Aneutronic fusion
* Ángel Rodríguez Lozano
* Angelo Battelli
* Angioletta Coradini
* Angle-resolved photoemission spectroscopy
* Angle of attack
* Angle of climb
* Angle of incidence
* Angle of refraction
* Angle of repose
* Angstrom
* Angstrom exponent
* Angular Momentum Commutator
* Angular acceleration
* Angular diameter distance
* Angular displacement
* Angular frequency
* Angular momentum
* Angular momentum commutator
* Angular momentum coupling
* Angular momentum of light
* Angular momentum operator
* Angular size redshift relation
* Angular spectrum method
* Angular velocity
* Anharmonicity
* Anil Bhardwaj
* Animal echolocation
* Anirudh Singh (activist)
* Anisothermal plasma
* Anisotropic liquid
* Anita Goel
* Ann Nelson
* Anna Maria Nobili
* Annalen der Physik
* Annales Henri Poincaré
* Annales de chimie et de physique
* Annals of Physics
* Annealed disorder
* Annihilation
* Annular dark-field imaging
* Annular fin
* Annular velocity
* Annus Mirabilis papers
* Annus mirabilis
* Anode ray
* Anomalon
* Anomalous Diffraction Theory
* Anomalous X-ray pulsar
* Anomalous cosmic ray
* Anomalous diffusion
* Anomalous electric dipole moment
* Anomalous magnetic dipole moment
* Anomalous photovoltaic effect
* Anomalous scaling dimension
* Anomaly (physics)
* Anomaly matching condition
* Anosov diffeomorphism
* Ansar Pervaiz
* Ansatz
* Anselmus de Boodt
* Antarctic Impulse Transient Antenna
* Antarctic Muon And Neutrino Detector Array
* Antenn. Wireless Propag. Lett.
* Antenn. Wireless Propag. Lett. IEEE
* Antenn Wireless Propag Lett, IEEE
* Antenna array (electromagnetic)
* Antenna noise temperature
* Antennas and Wireless Propagation Letters (IEEE)
* Anthelion
* Anthony E. Siegman
* Anthony French
* Anthony Ichiro Sanda
* Anthony J. DeMaria
* Anthony James Leggett
* Anthony Kelly (academic)
* Anthony M. Johnson
* Anthony Zee
* Anthropic principle
* Anti-gravity
* Anti-laser
* Anti-phase domain
* Anti-reflective coating
* Anti-scatter grid
* Anti-scratch coating
* Anti-shock body
* Anti-vibration compound
* Anti-de Sitter space
* Antibubble
* Anticrepuscular rays
* Antidynamo theorem
* Antiferroelectricity
* Antiferromagnetic interaction
* Antiferromagnetism
* Antigluon
* Antihydrogen
* Antimatter
* Antimatter catalyzed nuclear pulse propulsion
* Antimatter comet
* Antimatter rocket
* Antimatter tests of Lorentz violation
* Antimatter weapon
* Antimo Palano
* Antineutrino
* Antineutron
* Antinucleon
* Antiparticle
* Antiphase
* Antiphoton
* Antiproton
* Antiproton Decelerator
* Antiprotonic helium
* Antiquarian science books
* Antistatic agent
* Antistatic wrist strap
* Antoine César Becquerel
* Antoine de Chézy
* Anton Ambschel
* Anton Kapustin
* Anton Maria Schyrleus of Rheita
* Anton Oberbeck
* Anton Peterlin (physicist)
* Anton Zeilinger
* Antonia Terzi
* Antonie van Leeuwenhoek
* Antonino Zichichi
* Antonio Ferri
* Antonio Pacinotti
* Antonio Signorini (physicist)
* Antonio Zichichi
* Antonius van den Broek
* Antony Garrett Lisi
* Antony Hewish
* Antony Jameson
* Antony Valentini
* Antun Karlo Bakotić
* Anwar Ali (scientist)
* Anyon
* Ányos Jedlik
* Apache Point Observatory Galactic Evolution Experiment
* Apache Point Observatory Lunar Laser-ranging Operation
* Aperture
* Apollo M. O. Smith
* Apoorva D. Patel
* Apparent horizon
* Apparent magnitude
* Apparent viscosity
* Apparent weight
* Appell's equation of motion
* Application of tensor theory in physics
* Applications of the Stirling engine
* Applied Optics
* Applied physics
* Applied Physics A
* Applied Physics B
* Applied Physics Express
* Applied Physics Letters
* Applied Spectroscopy (journal)
* Applied Spectroscopy Reviews
* Applied mechanics
* Applied physics
* Applied spectroscopy
* Apse line
* Apsidal precession
* Apsis
* ArDM
* ArXiv
* Arago spot
* Arbitrary unit
* Arc suppression
* Archeops
* Archer's paradox
* Archibald Hill
* Archibald Howie
* Archibald Low
* Archie G. Worthing
* Archimedean point
* Archimedes
* Archimedes' principle
* Archimedes number
* Architectural acoustics
* Archive for Rational Mechanics and Analysis
* Archytas
* Arcminute Cosmology Bolometer Array Receiver
* Arctowski Medal
* Ardeshir Hosseinpour
* Area density
* Area rule
* Areal velocity
* Arend Joan Rutgers
* Areostationary orbit
* Areostationary satellite
* Areosynchronous orbit
* Areosynchronous satellite
* Argo (oceanography)
* Argonne Tandem Linear Accelerator System
* Argument of periapsis
* Argus laser
* Arie Andries Kruithof
* Arie Bodek
* Aristotelian physics
* Aristotelian theory of gravity
* Aristotle
* Arizona Accelerator Mass Spectrometry Laboratory
* Arkady Migdal
* Arlie Petters
* Armand de Waele
* Armature reaction drop
* Arne Bjerhammar
* Arno Allan Penzias
* Arnold Eucken
* Arnold Flammersfeld
* Arnold Kosevich
* Arnold Kramish
* Arnold Sommerfeld
* Arnold diffusion
* Arrayed waveguide grating
* Arrow of time
* Arseny Sokolov
* Arthur Ashkin
* Arthur B. C. Walker, Jr.
* Arthur B. McDonald
* Arthur C. Hardy
* Arthur Compton
* Arthur Covington
* Arthur Eddington
* Arthur Edward Ruark
* Arthur Erich Haas
* Arthur F. Turner
* Arthur Geoffrey Walker
* Arthur Gordon Webster
* Arthur H. Rosenfeld
* Arthur Iberall
* Arthur Jaffe
* Arthur Jeffrey Dempster
* Arthur Korn
* Arthur König
* Arthur L. Schawlow Prize in Laser Science
* Arthur Leonard Schawlow
* Arthur Louis Day
* Arthur Maitland
* Arthur Morin
* Arthur Nowick
* Arthur R. von Hippel
* Arthur Roberts (physicist)
* Arthur S. Lodge
* Arthur Schuster
* Arthur Scott King
* Arthur Stanley Mackenzie
* Arthur Stewart Eve
* Arthur W. Barton
* Arthur Wehnelt
* Arthur Wightman
* Arthur William Rucker
* Arthur Williams Wright
* Arthur Zajonc
* Arthur von Oettingen
* Artificial dielectric
* Artificial dielectrics
* Artificial disintegration
* Artificial gravity
* Artificial magnetic conductor
* Artificial photosynthesis
* Artificial wave
* Artur Ekert
* Artyom Alikhanian
* Arun K. Pati
* Arvind Rajaraman
* Aryeh Kaplan
* Asbestiform
* Ascher H. Shapiro
* Asher A. Friesem
* Asher Peres
* Ashesh Prosad Mitra
* Ashok Das
* Ashoke Sen
* Ashtekar variables
* Askaryan Radio Array
* Askaryan effect
* Aspect ratio (wing)
* Aspera European Astroparticle network
* Asperity (materials science)
* Aspheric lens
* Aspirator (pump)
* Associated Legendre polynomials
* Association of Los Alamos Scientists
* Astatic galvanometer
* Asterix IV laser
* Asteroseismology
* Astigmatism
* Astro Space Center (Russia)
* Astrochemistry
* Astron (fusion reactor)
* Astronautics
* Astronomia nova
* Astronomical seeing
* Astronomical spectroscopy
* Astronomical system of units
* Astronomy
* Astronomy & Astrophysics
* Astronomy & Geophysics
* Astronomy Letters
* Astronomy Reports
* Astronomy and Astrophysics Decadal Survey
* Astronomy and Geophysics
* Astroparticle Physics (journal)
* Astroparticle physics
* Astrophysical X-ray source
* Astrophysical plasma
* Astrophysics
* Astrophysics Data System
* Astrophysics Data Systems
* Astrophysics and Space Science
* Asymptotic freedom
* Asymptotic homogenization
* Asymptotically flat spacetime
* Asım Orhan Barut
* Atacama Large Millimeter Array
* Ataç İmamoğlu
* Athene Donald
* Atkinson friction factor
* Atkinson resistance
* Atmosphere
* Atmosphere of Earth
* Atmosphere of Titan
* Atmosphere of Uranus
* Atmospheric-pressure chemical ionization
* Atmospheric-pressure plasma
* Atmospheric Radiation Measurement
* Atmospheric diffraction
* Atmospheric duct
* Atmospheric ducting
* Atmospheric dynamo
* Atmospheric electricity
* Atmospheric entry
* Atmospheric methane
* Atmospheric physics
* Atmospheric pressure
* Atmospheric pressure discharge
* Atmospheric radiative transfer codes
* Atmospheric refraction
* Atmospheric sciences
* Atmospheric sounding
* Atmospheric stratification
* Atmospheric thermodynamics
* Atmospheric wave
* Atom
* Atom: Journey Across the Subatomic Cosmos
* Atom laser
* Atom optics
* Atom probe
* Atom vibrations
* Atomic, molecular, and optical physics
* Atomic Emission Spectrum
* Atomic Energy of Canada Limited
* Atomic and molecular astrophysics
* Atomic battery
* Atomic beam
* Atomic clock
* Atomic coherence
* Atomic diffusion
* Atomic electron configuration table
* Atomic electron transition
* Atomic emission spectrum
* Atomic force microscopy
* Atomic form factor
* Atomic fountain
* Atomic gas
* Atomic line filter
* Atomic mass unit
* Atomic mirror
* Atomic nucleus
* Atomic number
* Atomic orbital
* Atomic orbital model
* Atomic packing factor
* Atomic percent
* Atomic physics
* Atomic ratio
* Atomic scale
* Atomic scales
* Atomic spacing
* Atomic spectral line
* Atomic theory
* Atomic units
* Atomichron
* Atomics International
* Atomism
* Atomistix Virtual NanoLab
* Attenuation
* Attenuation (electromagnetic radiation)
* Attenuation coefficient
* Attenuation length
* Attophysics
* Attosecond physics
* Atwood machine
* Atwood number
* Audio frequency
* Audio power
* Aufbau principle
* Auger effect
* Auger electron spectroscopy
* August Beer
* August H. Pfund
* August Herman Pfund
* August Krönig
* August Kundt
* August Musger
* August Seebeck
* August Seydler
* August Toepler
* August Witkowski
* Auguste Bravais
* Auguste Piccard
* Augustin-Jean Fresnel
* Augustin-Louis Cauchy
* Augusto Righi
* Augustus William Smith
* Aureole effect
* Aurora (astronomy)
* Aurora of November 17, 1882
* Auroral chorus
* Austin Model 1
* Australian Atomic Energy Commission
* Australian Journal of Physics
* Australian Nuclear Science and Technology Organisation
* Australian Synchrotron
* Autler–Townes effect
* Autocollimation
* Autocollimator
* Autodynamics
* Automated Radioxenon Sampler Analyzer
* Automatic calculation of particle interaction or decay
* Automobile drag coefficient
* Autonomous system (mathematics)
* Autorotation (helicopter)
* Autostereoscopy
* Auxetics
* Auxiliary field
* Auxiliary field Monte Carlo
* Available energy (particle collision)
* Avalanche breakdown
* Avery Gilbert
* Avishai Dekel
* Avogadro's law
* Avrami equation
* Avshalom Elitzur
* Axel Scherer
* Axel T. Brunger
* Axial-flow pump
* Axial multipole moments
* Axial pen force
* Axial precession
* Axial ratio
* Axial tilt
* Axiality and rhombicity
* Axicon
* Axilrod–Teller potential
* Axino
* Axiomatic quantum field theory
* Axion
* Azeotrope
* Azimuthal quantum number