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This glossary of physics terms is a list of definitions about physics, its sub-disciplines, and related fields. == A == *Abbe number – *Absolute electrode potential – *Absolute humidity – The ratio of water vapor in a sample of air to the volume of the sample *Absolute magnitude – *Absolute motion – *Absolute pressure – *Absolute scale – *Absolute zero – The theoretical lowest possible temperature. More formally, it is the theoretical temperature at which entropy reaches its minimum value. *Absorptivity – *Accelerating universe – *Acceleration – The rate at which the velocity of a body changes with time *Acceleration due to gravity – The acceleration on an object caused by force of gravitation *Accelerometer – *Acoustics – The branch of physics dealing with the production, transmission and effects produced by sound *Adhesion – The tendency of dissimilar particles or surfaces to cling to one another *Adiabatic cooling – *Adiabatic heating – *Aerodynamics – *Afocal system – *Air mass – *Air mass (astronomy) – *Air mass (solar energy) – *Albedo – The fraction of the total light incident on a reflecting surface, especially a celestial body, which is reflected back in all directions *Alloy – *Alpha particle – Consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is classically produced in the process of alpha decay, but may be produced also in other ways and given the same name. *Alternating current – A form of electric current in which the movement of electric charge periodically reverses direction. *Alternative hypothesis – *Ammeter – An instrument that is used to measure current. *Amorphous solid – *Ampere – A unit that describes the rate of flow of electricity (current). *Amplifier – *Amplitude – Height of a wave measured from its centre (normal) position. For example, the height of a water wave above the level of calm water. *Angle of incidence – *Angle of reflection – *Angstrom – *Angular acceleration – *Angular displacement – *Angular frequency – *Angular momentum – *Angular velocity – *Anion – negatively charged ion *Annihilation – *Anode – *Antigravity – *Antimatter – *Antineutron – *Antiparticle – *Antiproton – *Arc length – *Archimedes' principle – *Area moment of inertia – *Astronomical unit – *Astrophysics – The branch of astronomy that deals with the physics of the universe, especially with "the nature of the heavenly bodies, rather than their positions or motions in space *Attenuation coefficient – *Atom – A basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons *Atomic line filter – *Atomic mass unit – one-twelfth the mass of an atom of the isotope C *Atomic number – The number of protons found in the nucleus of an atom. Represented by the letter "Z," it is most often used to classify elements (see periodic table) *Atomic packing factor – *Atomic physics – *Atomic structure – *Atomic weight – *Audio frequency – *Avogadro constant – *Avogadro's Law - it states that volumes of gases which are equal to each other at the same temperature and pressure will contain equal numbers of molecules *Avogadro's Number – the number of molecules in exactly 12g of carbon-12, equaling 6.022 x 1023. *Azimuthal quantum number – 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Glossary of physics」の詳細全文を読む スポンサード リンク
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