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.

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