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  • observationSee measurement in quantum mechanics and see observer. Read More
  • observerIn quantum mechanics, the term "observer" is used in a specialized manner. It has a meaning quite different from that of the(...) Read More
  • open sytemSee system. Read More
  • operatorIn mathematics, “operator” has two main definitions. 1) An operator is a mathematical symbol, for example +, that represents(...) Read More
  • orbitalIn the early 1900's, when physicists were first probing the insides of the atom, they thought that electrons might travel(...) Read More
  • orbital angular momentum(Symbol: ɭ or L). Electrons have two types of rotational motion: orbital angular momentum and spin. Orbital angular momentum(...) Read More
  • ordinary matterScientists call the everyday matter of our world, such as tables and chairs, “ordinary matter.” Ordinary matter is made up(...) Read More
  • oscillationDefinition (1): An oscillation is a repetitive back-and-forth motion. A pendulum swinging back and forth is an everyday(...) Read More
  • oscillatorAn oscillator is something that oscillates. Something that vibrates. See oscillation for more information. [caption(...) Read More