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  • d

  • 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
    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
  • f

  • 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
  • g

  • 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
  • h

  • Heisenberg Uncertainty Principle (HUP)
    [This article is under construction.]

    The Heisenberg Uncertainty Principle (HUP) says that atoms and the components of(...) - Read More

  • i

  • 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
  • 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
  • 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