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  • q

  • QFT
    Quantum Field Theory (QFT) is the current theory of how atomic and subatomic particles behave. It is the most up-to-date(...) - Read More
  • quantum angular momentum
    For quantum angular momentum, see angular momentum. - Read More
  • quantum decoherence
    For quantum decoherence, see  decoherence. - Read More
  • Quantum Field Theory
    Quantum Field Theory (QFT) is the current theory of how atomic and subatomic particles behave. It is the most up-to-date(...) - Read More
  • quantum number
    Electrons have a few handfuls of properties. Four have been selected as the electron’s “quantum numbers.” The quantum(...) - Read More
  • quantum randomness
    Many quantum physicists view quantum mechanics as differing from classical physics in a fundamental way—quantum mechanics is(...) - Read More
  • quantum spin
    See "spin." - Read More
  • r

  • random
    In classical physics, events are random only due to insufficient information. Let’s take the example of a coin toss. With an(...) - Read More
  • renormalization
    Renormalization is a technique for achieving greater precision in certain physics theories.* In quantum mechanics,(...) - Read More
  • rotational momentum
    Rotational momentum is the same thing as “angular momentum.” It is the momentum or oomph that an object has when it rotates(...) - Read More
  • s

  • scanning tunneling microscope
    A scanning tunneling microscope (STM) is a type of electron microscope. It is much more powerful than an ordinary microscope(...) - Read More
  • singularity
    “Singularity” has a physics definition and a mathematical definition. Both definitions are given here. They fit together(...) - Read More
  • Sommerfeld's Constant
    See alpha, α. - Read More
  • spin
    Spin is a property of subatomic and atomic particles. While spin was originally thought of as a particle twirling on its(...) - 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
  • t

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

  • wave
    A wave is a movement that propagates through a medium. The accompanying animation demonstrates the motion of a seismic wave,(...) - Read More
  • wave equation
    This article starts with the nature of wave equations in classical physics and moves into a brief description of the(...) - Read More