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  • conjugate pairs
    Conjugate pairs are pairs of properties to which the Heisenberg Uncertainty Principle applies. Conjugate pairs are also(...) Read More
  • conservation laws
    Physics includes several conservation laws. The most well-known is the Law of Conservation of Energy. This law states that(...) Read More
  • conservation of energy
    The Law of Conservation of Energy says that in our universe the amount of energy remains constant. Energy cannot be created(...) Read More
  • 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
  • conserved quantity
    A conserved quantity is something that remains constant in amount over time and cannot be created nor destroyed. Conserved(...) Read More
  • constant
    A constant is a number or symbol that always has the same value. There are four types of constants: A mathematical(...) Read More
  • constant of nature
    A constant of nature is another way of saying a "physical constant." Read More
  • Copenhagen Interpretation
    The Copenhagen Interpretation of quantum mechanics is the original attempt by physicists to provide an explanation for the(...) Read More
  • Coulomb's Law
    Coulomb’s Law is a formula that allows us to calculate the electric force generated between two electrical charges.(...) Read More
  • dark energy
    Dark energy is the name given to an unexplained aspect of the universe. Dark energy has been postulated as an explanation(...) Read More
  • dark matter
    "Dark matter" is a name that’s been given to a substance which many scientists believe may exist. If it exists, this(...) Read More
  • de Broglie-Bohm interpretation of quantum mechanics
    This interpretation of quantum mechanics is also called the "Bohmian Interpretation." It was originally proposed by(...) Read More
  • decoherence
    (Also called "quantum decoherence.”) Decoherence occurs when a quantum particle loses(...) Read More
  • dimensionless number
    Pi is an example of a dimensionless number. A dimensionless number doesn’t imply any measurement units. Pi is just 3.14, not(...) Read More
  • dynamic system
    A dynamic system is a system that changes over time. It can also be called a "dynamical system." While some maintain that(...) Read More
  • dynamical system
    See dynamic system. Read More
  • e
    e is the symbol for Euler's number. Similarly to pi, e is a constant which occurs repeatedly throughout nature. It has a(...) Read More
  • Euler's number (e)
    Euler's number, similarly to pi, is a constant which occurs repeatedly throughout nature. It is symbolized as e. It has a(...) Read More
  • experimental physics
    For experimental physics, see  theoretical physics. Read More
  • fine-structure constant
    See alpha, , α.  Read More
  • Free Will Theorem
    Do quantum particles have free will? Can they make choices? Some physicists have considered this question seriously. But(...) Read More
  • frequency
    Frequency is the number of repeated motions in a period of time. These motions can be up and down, like a hammer, or back(...) Read More
  • frequency and wavelength
    Frequency and wavelength are both properties of waves. They are closely related, so this article discusses the two(...) Read More
  • function
    The term “function” is important in the field of quantum mechanics because is it the basis of the key term “wave function.”(...) Read More
  • Guiding Wave Interpretation of quantum mechanics
    The Guiding Wave Interpretation of quantum mechanics is also called the "Bohmian Interpretation" as David Bohm was one of(...) Read More
  • Heisenberg Uncertainty Principle (HUP)
    The Heisenberg Uncertainty Principle (HUP) is also called the “Indeterminacy Principle” or simply, the "Uncertainty(...) Read More
  • HUP
    “HUP” stands for the Heisenberg Uncertainty Principle, which see. Read More
  • i
    The letter i is the symbol for the square root of -1. In other words i = √-1. The symbol i often appears in the equations of(...) Read More
  • idealism
    In ordinary English, "idealism" is contrasted with pragmatism. "Idealism" refers to the prioritizing of ideals. The meaning(...) Read More