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

Ultraviolet Radiation

Ultraviolet Radiation, electromagnetic radiation with wavelengths between those of visible violet light and those of X rays.

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  • Expansion


    Expansion, an increase in the volume of a substance, usually due to the addition of heat to the substance. See more »

  • Heat


    Heat, the energy possessed by molecules because of their motion. Since all solids, liquids, and gases are made of molecules that move about, all such substances contain heat. See more »

  • How are frequency and wavelength of light related?

    How are frequency and wavelength of light related?

    Frequency has to do with wave speed and wavelength is a measurement of a wave's span. Learn how frequency and wavelength of light are related in this article. 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 »

  • Physics


    Physics, the science that deals with matter and energy and the relationships that exist between them. See more »

  • Pyrometer


    Pyrometer, an instrument for measuring temperature. Although the term pyrometer is generally considered to apply to instruments that measure high temperatures only, some pyrometers are designed to measure low temperatures. See more »

  • Solid-State Physics

    Solid-State Physics

    Solid-state Physics, the branch of physics that deals with the structure and properties of solids. See more »

  • Calorie


    Calorie, a unit for measuring the amount of heat released or absorbed by a substance. See more »

  • Calorimeter


    Calorimeter, an instrument for measuring the amount of heat released or absorbed in physical and chemical processes. See more »

  • Capillary Action

    Capillary Action

    Capillary Action, or Capillarity, the tendency of liquids to rise or to be depressed in tubes of small diameter. See more »

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