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Online Physics Glossary
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Word Meaning Remarks
Galvanometer Device used to measure very small currents.
Gamma decay Process by which a nucleus emits a gamma ray.
Gamma particle High energy photon emitted by a radioactive nucleus.
Gas State of matter that expands to fill container.
Geiger-Mueller tube Device used to detect radiation using its ability to ionize matter.
General theory of relativity Explanation of gravity and accelerated motion invented by Einstein.
Gluon Carrier of strong nuclear force.
Grand unified theories Theories being developed that unify the stronger and electroweak forces into one force.
Gravitational field Distortion of space due to the presence of mass.
Gravitational force Attraction between two objects due to their mass.
Gravitational mass Ratio of gravitational force to objectís acceleration.
Gravitational potential energy Change of energy of object when moved in a gravitational field.
Graviton Particle that carries the gravitational force. Not yet observed.
Ground state Lowest energy level of an electron in an atom.
Grounding Process of connecting a charged object to Earth to remove objectís unbalanced charge.
 
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