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  • i

  • imaginary numberAn 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 PrincipleThe “Indeterminacy Principle” is another name for the Heisenberg Uncertainty Principle (HUP). See the Heisenberg Uncertainty(...) Read More
  • interpretation of quantum mechanicsAn interpretation of quantum mechanics describes the nature of reality in the quantum realm. Quantum mechanics is a set of(...) Read More
  • ionAn 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
  • ionizeTo 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
  • isotopeIsotopes are a special kind of atom. Atoms with the same number of protons but different numbers of neutrons are isotopes of(...) Read More
  • j

  • JouleA 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 EnergyThe 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 MatterThe Law of Conservation of Matter was abandoned as inaccurate by physicists early in the 1900’s. For more information, see(...) Read More
  • linear momentumLinear 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
  • localityIn everyday life, we assume the principle of locality. Here’s the principle of locality: Causing an effect on an object or(...) Read More
  • logicalLogical reasoning is reasoning that draws conclusions based on correct understanding of relationships. Here are examples of(...) Read More
  • m

  • magnetic momentThe 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 electronThe 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 constantPi 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 ProblemUnderstanding the Measurement Problem requires understanding the unique role of measurement in quantum mechanics. The entry(...) Read More
  • metalA metal is a kind of matter, usually derived from rocks found in nature. Examples of metals include iron, aluminum, and(...) Read More
  • minimal theoryA 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 a force that rotates the object. The term “moment” is used in regard to a(...) Read More
  • moment of forceMoment 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 momentumIn 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

  • nonlocalityThe principle of nonlocality in quantum mechanics says that quantum particles can “know” the states of other quantum(...) Read More
  • normal matterScientists call the everyday matter of our world, such as tables and chairs, “normal matter.” Normal matter is made up of(...) Read More
  • o

  • observationSee measurement in quantum mechanics and see observer. Read More
  • observerIn quantum mechanics, the term "observer" is used in a specialized manner. It has a meaning quite different from that of the(...) Read More