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## Absorption

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## Absorption of electromagnetic radiation

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## Acceleration measurement

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## Accelerometer

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## Acceptor atom

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## Acoustic emission

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## Acoustic interferometer

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## Acoustic noise

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## Acoustic radiation pressure

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## Acoustic torpedo

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## Acoustical holography

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## Acoustics

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## Acoustooptics

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## Active sound control

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## Activity (thermodynamics)

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## Activity-based costing

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## Adaptive optics

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## Addition

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## Adiabatic demagnetization

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## Adiabatic process

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## Admittance

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## Aerodynamic force

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## Aerodynamic wave drag

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## Aerodynamics

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## Aharonov-Bohm effect

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## Algebra

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## Algebraic geometry

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## Almanac

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## Alternating-current circuit theory

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## Altimeter

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## Amorphous solid

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## Ampere's law

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## Amplitude (wave motion)

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## Analog states

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## Analysis of variance

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## Analytic geometry

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## Analytic hierarchy

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## Anechoic chamber

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## Angular correlations

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## Anharmonic oscillator

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## Antiferromagnetism

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## Antihydrogen

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## Antimatter

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## Antiresonance

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## Anyons

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## Archimedes' principle

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## Architectural acoustics

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## Area

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## Arithmetic

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## Artificially layered structures

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## Asymptote

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## Atom

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## Atom cluster

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## Atom laser

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## Atom optics

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## Atomic beams

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## Atomic Fermi gas

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## Atomic mass

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## Atomic mass unit

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## Atomic nucleus

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## Atomic number

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## Atomic physics

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## Atomic theory

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## Atomic time

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## Atomization

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## Attenuation

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## Attenuation (electricity)

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## Auger effect

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## Ballistics

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## Band spectrum

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## Band theory of solids

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## Barycentric calculus

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## Baryon

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## Bayesian statistics

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## Beam-foil spectroscopy

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## Beat

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## Bessel functions

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## Beta particles

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## Binoculars

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## Bioacoustics, animal

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## Biomedical ultrasonics

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## Biometrics

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## Biot-Savart law

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## Birefringence

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## Black hole

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## Bloch theorem

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## Bose-Einstein condensation

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## Bose-Einstein statistics

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## Boyle's law

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## Bremsstrahlung

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## Brownian movement

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## Buoy

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## Catenary

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## Cellphone camera

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