Major physics terms are explained in these articles. Here you can learn about some of the fundamental physics concepts.


X Rays, electromagnetic radiation similar to that of visible light, but of much shorter wavelength.

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  • Geissler Tube

    Geissler Tube

    Geissler Tube, an electron tube that is used to study the behavior of gases. It was invented in the 1860's by Heinrich Geissler, a German. See more »

  • Lenz's Law

    Lenz's Law

    Lenz's Law, a law of electromagnetic induction formulated in 1833 by the German physicist H. See more »

  • Mass (physics)

    Mass (physics)

    Mass, in physics, the property of matter that causes it to have inertia. (Inertia is the resistance of an object to any change in its motion.) The more mass an object has, the more inertia it has. See more »

  • Mass Spectroscope

    Mass Spectroscope

    Mass Spectroscope, an instrument used to measure the mass of atoms and molecules. See more »

  • Perpetual Motion Machine

    Perpetual Motion Machine

    Perpetual Motion Machine, a device that will run forever without any outside source of energy. See more »

  • Radiometer


    Radiometer, an instrument designed to detect and measure radiant energy. A simple type, devised by Sir William Crookes, consists of four vanes of mica or aluminum foil that revolve on a needle point within a glass globe from which most of the air has been removed. See more »

  • Regelation


    Regelation, the melting of ice under pressure and its refreezing when the pressure is relieved. See more »

  • Relativity, Theory of

    Relativity, Theory of

    Relativity, Theory of, a description of space and time as determined by physical measurements. See more »

  • Specific Heat

    Specific Heat

    Specific Heat, a measure of the heat required to raise the temperature of a given amount of a substance by one degree. See more »

  • String Theory

    String Theory

    String Theory, in physics, a theory that describes the most elementary objects in nature as extremely small, one-dimensional structures called strings. See more »

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