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Online Physics Glossary
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Word Meaning Remarks
Zero-point energy The lowest energy state of molecular vibration.
Absolute zero Lowest possible temperature at which gas would have a zero volume.
Absorption spectrum Spectrum of electromagnetic radiation absorbed by matter when radiation of all frequencies is passed through it.
Acceleration Change in velocity divided by time interval over which it occurred. IGCSE
Accuracy Closeness of a measurement to the standard value of that quantity.
Achromatic lens Lens for which all light colors have the same focal length.
Action-reaction forces Pair of forces involved in an interaction that are equal in magnitude and opposition in direction.
Activity Number of decays per second of a radioactive substance.
Adhesion Force of attraction between two unlike materials.
Air resistance Force of air on objects moving through it.
Alpha decay Process in which a nucleus emits an alpha particle.
Alpha particle Positively- charged particles consisting of two protons and two neutrons emitted by radioactive materials.
Ammeter Device to measure electrical current.
Amorphous solid Solids that have no long- range order; no crystal structure.
Ampere Unit of electric current; one ampere is the flow of one coulomb of charge per second.
 
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