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In physics, mass (from Ancient Greek: μᾶζα) commonly refers to any of three properties of matter, which have been shown experimentally to be equivalent:

  • inertial mass,
  • active gravitational mass, and
  • passive gravitational mass.

Although mass must be distinguished from matter in physics, because matter is a poorly-defined concept, and although all types of agreed-upon matter exhibit mass, it is also the case that many types of energy which are not matter—such as potential energy, kinetic energy, and trapped electromagnetic radiation (photons)—also exhibit mass. Thus, all matter has the property of mass, but not all mass is associated with identifiable matter.

In everyday usage, "mass" is often used interchangeably with weight, and the units of weight are often taken to be kilograms (for instance, a person may state that his weight is 75 kg). In proper scientific use, however, the two terms refer to different, yet related, properties of matter.

[edit] Also see

[edit] Reference

  • Wikipedpia see Mass [1]

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