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  • 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
  • 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
  • m

  • mathematical constant
    Pi and e are examples of mathematical constants. A mathematical constant has the same value no matter which mathematical(...) - 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
  • 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

  • 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

  • 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
  • p

  • p
    (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