Physics Dictionary
A
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| absolute index of refraction |  |  | 
| absolute temperature |  |  | 
| absolute temperature scale |  |  | 
| absolute zero |  |  | 
| absorption spectrum |  |  | 
| acceleration |  |  | 
| acceleration due to gravity |  |  | 
| acceleration in circular motion |  |  | 
| accelerator |  |  | 
| accumulator |  |  | 
| action and reaction, law of |  |  | 
| action at a distance |  |  | 
| adhesive force |  |  | 
| air pressure gauge |  |  | 
| air pump |  |  | 
| air tight |  |  | 
| air track |  |  | 
| alloy |  |  | 
| alpha particle |  |  | 
| alternating current (A.C.) |  |  | 
| alternating current generator |  |  | 
| alternator |  |  | 
| altimeter |  |  | 
| ambient temperature |  |  | 
| ammeter |  |  | 
| ampere (A) |  |  | 
| ampere hour |  |  | 
| Ampere's law |  |  | 
| amplification |  |  | 
| amplifier |  |  | 
| amplitude |  |  | 
| amplitude modulation (A.M.) |  |  | 
| analog |  |  | 
| anemometer |  |  | 
| aneroid barometer |  |  | 
| Angstrom unit (  ) |  |  | 
| angular acceleration |  |  | 
| angular deviation |  |  | 
| angular displacement |  |  | 
| angular harmonic motion |  |  | 
| angular momentum |  |  | 
| angular motion |  |  | 
| angular velocity |  |  | 
| anion |  |  | 
| annular eclipse |  |  | 
| anode |  |  | 
| antenna |  |  | 
| anticlockwise moment |  |  | 
| antinode |  |  | 
| aperture |  |  | 
| apparent depth |  |  | 
| Archimedes' principle |  |  | 
| armature |  |  | 
| astigmatism |  |  | 
| astronomical telescope |  |  | 
| astronomy |  |  | 
| astrophysics |  |  | 
| atmosphere |  |  | 
| atmospheric pressure |  |  | 
| atom |  |  | 
| atomic bomb |  |  | 
| atomic energy |  |  | 
| atomic heat |  |  | 
| atomic mass |  |  | 
| atomic nucleus |  |  | 
| atomic number |  |  | 
| atomic structure |  |  | 
| atomic weight |  |  | 
| atto (a) |  |  | 
| attraction |  |  | 
| attractive force |  |  | 
| audibility |  |  | 
| audible range |  |  | 
| audio frequency |  |  | 
| average acceleration |  |  | 
| average life |  |  | 
| average velocity |  |  | 
| Avogadro's number (NA) |  |  | 
| axis |  |  | 
| axis of rotation |  |  |