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  • m
  • metal
    A metal is a kind of matter, usually derived from rocks found in nature. Examples of metals include iron, aluminum, and(...) - Read More
  • minimal theory
    A minimal theory in physics is a theory that accounts for known phenomena with the simplest approach conceivable. Of course,(...) - Read More
  • moment
    “Moment,” as used in physics, means the amount of force experienced by an object due to the amount of force applied at a(...) - Read More
  • moment of force
    Moment of force is also called torque. “Moment,” as used in physics, means the amount of force experienced by an object due(...) - Read More
  • moment of momentum
    In classical physics, moment of momentum is the momentum or oomph which an object has as it rotates about an axis. It is the(...) - Read More
  • momentum
    (Abbreviated p. Momentum is the oomph something has due to having mass that’s in motion. Let’s say you just happen to be(...) - Read More
  • n
  • nonlocality
    The principle of nonlocality in quantum mechanics says that quantum particles can “know” the states of other quantum(...) - Read More
  • normal matter
    Scientists call the everyday matter of our world, such as tables and chairs, “normal matter.” Normal matter is made up of(...) - Read More
  • o
  • observation
    See measurement in quantum mechanics and see observer. - Read More
  • observer
    In quantum mechanics, the term "observer" is used in a specialized manner. It has a meaning quite different from that of the(...) - Read More
  • open sytem
    See system. - Read More
  • operator
    In mathematics, “operator” has two main definitions. 1) An operator is a mathematical symbol, for example +, that represents(...) - 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 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
  • particle-wave duality
    When a photon hits your eye, it’s a particle. When it hits your eye, it interacts with a particular electron in the retina(...) - 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