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I Is it possible for pure energy to have mass?

  1. Apr 24, 2016 #1
    When I ask about mass, I am really asking is it remotely possible for pure energy to have mass and possible become so dense it forms a ball with its own gravitational pull. This pull keeps the energy in a ball.
  2. jcsd
  3. Apr 24, 2016 #2
    Photon has mass as well as momentum but no rest mass so it can treat it as pure energy.
  4. Apr 24, 2016 #3

    Vanadium 50

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    Energy is not a substance. "Pure energy" is a creation of science fiction writers.
  5. Apr 24, 2016 #4
    So than that makes photons the most basic form of energy or just one of the many types of energy like electromagnetic and kinetic?
  6. Apr 25, 2016 #5
  7. Apr 25, 2016 #6


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    Energy is a property of an object or system, like momentum, angular momentum, mass, and charge. There is no such thing as "pure energy" not associated with an object or system, just like there is no such thing as "pure momentum" or "pure charge."
  8. Apr 25, 2016 #7


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    A pair of photons that whose momenta are not parallel could be considered to be a system consisting of "pure energy" and nonetheless have a non-zero invariant mass.
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