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  • i
  • imaginary number
    An imaginary number is one that includes the square root of -1, written √(-1). While one might think that such a number(...) Read More
  • indeterminacy
    “Indeterminacy” or “quantum indeterminacy” refers to the uncertainty of results when measuring certain pairs of properties(...) Read More
  • Indeterminacy Principle
    The “Indeterminacy Principle” is another name for the Heisenberg Uncertainty Principle (HUP). See the Heisenberg Uncertainty(...) Read More
  • interpretation of quantum mechanics
    An interpretation of quantum mechanics describes the nature of reality in the quantum realm. Quantum mechanics is a set of(...) Read More
  • ion
    An ion is formed when an atom gains or loses an electron. An atom which has lost one or more electrons has a positive(...) Read More
  • ionize
    To ionize is to convert a substance from atomic or molecular form to ions. An ion is a type of atom that has an imbalance(...) Read More
  • isotope
    Isotopes are a special kind of atom. Atoms with the same number of protons but different numbers of neutrons are isotopes of(...) Read More
  • j
  • Joule
    A Joule is a unit for measuring energy. It's the amount of energy needed to lift a medium tomato one meter off the surface(...) Read More
  • l
  • Law of Conservation of Energy
    The Law of Conservation of Energy says that the amount of energy in an isolated system remains constant. Energy cannot be(...) Read More
  • Law of Conservation of Matter
    The Law of Conservation of Matter was abandoned as inaccurate by physicists early in the 1900’s. For more information, see(...) Read More
  • linear momentum
    Linear momentum is the oomph something has due to having mass that’s in motion. If a football player were to ram into a(...) Read More
  • lines of force
    “Lines of force” can best be explained with an illustration. The photo shows the lines of magnetic force created with a(...) Read More
  • local realism
    [This article is under construction.] Local realism is a quick way of saying two principles: 1) Principle of locality:(...) Read More
  • locality
    In everyday life, we assume the principle of locality. Here’s the principle of locality: Causing an effect on an object or(...) Read More
  • logical
    Logical reasoning is reasoning that draws conclusions based on correct understanding of relationships. Here are examples of(...) Read More
  • m
  • magnetic moment
    The magnetic moment is the strength of the response of a piece of metal to a magnetic field. It is a measure of the degree(...) Read More
  • magnetic moment of the electron
    The magnetic moment of an electron is symbolized as g and is called the “g-factor.” The magnetic moment is the degree to(...) Read More
  • mathematical constant
    Pi and e are examples of mathematical constants. A mathematical constant has the same value no matter which mathematical(...) Read More
  • measurement in quantum mechanics
    (Also called “observation”). Measurement is of considerable consequence in the quantum world. At least in some(...) Read More
  • Measurement Problem
    Understanding the Measurement Problem requires understanding the unique role of measurement in quantum mechanics. The entry(...) Read More
  • 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