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  • q

  • quantum spinSee "spin." Read More
  • quantum theory“Quantum theory” is the original name for the field that became known as “quantum mechanics" (which see). The connotations(...) Read More
  • quantum worldSee quantum realm. Read More

  • r

  • randomIn classical physics, events are random only due to insufficient information. Let’s take the example of a coin toss. With an(...) Read More
  • realismIn everyday life, we in the Westernized world assume that an objective reality exists external to us. We usually assume that(...) Read More
  • renormalizationRenormalization is a technique for achieving greater precision in certain physics theories.* In quantum mechanics,(...) Read More
  • rotational momentumRotational momentum is the same thing as “angular momentum.” It is the momentum or oomph that an object has when it rotates(...) Read More
  • Rydberg atomA Rydberg atom has one or more electron(s) which have energy levels almost sufficient for the electron(s) to escape the(...) Read More

  • s

  • scanning tunneling microscopeA scanning tunneling microscope (STM) is a type of electron microscope. It is much more powerful than an ordinary microscope(...) Read More
  • Schrodinger's Cat Experiment[This article is under construction.] The Schrodinger Cat(...) Read More
  • singularity“Singularity” has a physics definition and a mathematical definition. Both definitions are given here. They fit together(...) Read More
  • Sommerfeld's ConstantSee alpha, α. Read More
  • spinSpin is a property of subatomic and atomic particles. While spin was originally thought of as a particle twirling on its(...) Read More
  • static systemSee dynamic system. Read More
  • Stern-Gerlach device(Also called a “Stern-Gerlach machine.”) The Stern-Gerlach (SG) device detects the “quantum spin” of atoms and subatomic(...) Read More
  • superpositionClick for quantum superposition or click for superposition of classical waves. Read More
  • superposition, classical wavesThis article is about superpositions of waves as understood In classical physics. See superposition, quantum mechanics for(...) Read More
  • superposition, quantumThe term "superposition" is used in both classical physics and quantum physics. In this article, "superposition" is(...) Read More
  • systemIn science, the term "system" takes the place of the common English words "thing" or "entity." Scientists use the term(...) Read More

  • t

  • TeslaA Tesla is a unit for measuring the strength of magnetism in any particular location. A Tesla is approximately the strength(...) Read More
  • theoretical physicsTheoretical physics is one of two branches of physics: theoretical and experimental. Like almost all other types of physics,(...) Read More
  • torqueFor torque, see “moment of force.” Read More
  • true randomnessSee entry for quantum randomness. Read More

  • w

  • waveA wave is a movement that propagates through a medium. The accompanying animation demonstrates the motion of a seismic wave,(...) Read More
  • wave equationThis article starts with the nature of wave equations in classical physics and moves into a brief description of the(...) Read More
  • waveformThe waveform is the shape of a wave. Below is a graph on paper of a waveform representing the sound waves created by blowing(...) Read More
  • wave frequencySee frequency. Read More
  • wave functionA wave function, in quantum mechanics, is an equation. It describes the behavior of quantum particles, usually electrons.(...) Read More
  • wavefunctionSee wave function. Read More
  • wave function collapseSee article collapse of the wave function.    Read More