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  • π
    See entry for pi. - 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
    (Also called “intrinsic angular momentum” or “inherent angular momentum”). Quantum Spin is a property of subatomic(...) - 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
  • 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
  • waveform
    The 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
  • wavelength
    Wavelength is a property of waves. It is the distance from wave crest to wave crest. Or from trough to trough—same distance.(...) - Read More