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  • pi
    Pi is symbolized π and pronounced like "pie." It is the mathematical symbol for the number 3.14159…, which goes on(...) - Read More
  • o

  • 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 matter
    Scientists call the everyday matter of our world, such as tables and chairs, “ordinary matter.” Ordinary matter is made up(...) - Read More
  • oscillation
    Definition (1): An oscillation is a repetitive back-and-forth motion. A pendulum swinging back and forth is an everyday(...) - Read More
  • oscillator
    An oscillator is something that oscillates. Something that vibrates. See oscillation for more information.

    [caption(...) - Read More

  • p

  • particle
    In everyday speech, a particle is a bit of matter. I might say that there is particle of dirt on the lens of my glasses.(...) - Read More
  • period
    If you were standing on a dock and water waves were coming at you, the period would be the time interval between waves. In(...) - Read More
  • Periodic Table of the Elements
    The Periodic Table of the Elements lists all the elements, over 100 of them, in a specific sequence. This includes the(...) - Read More
  • physical constant
    The constant c, the speed of light in a vacuum, is an example of a physical constant. It is a constant of nature, always(...) - Read More
  • probability amplitude
    “Probability amplitude” is a term used in quantum physics. It’s a number that appears in Schrodinger’s Wave Equation. Let’s(...) - Read More
  • q

  • QFT
    See Quantum Field Theory. - Read More
  • quantities of dimension one
    For “quantities of dimension one,” see “dimensionless number.” - Read More
  • quantum
    One definition of “quantum” is: a tiny packet of energy at the atomic level. A quantum is the smallest possible unit of(...) - 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 spin
    See "spin." - Read More
  • r

  • 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