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Mass and energy

  1. Jun 23, 2013 #1
    can mass be created from energy?
  2. jcsd
  3. Jun 23, 2013 #2


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    Not by humans, AFAIK.
  4. Jun 24, 2013 #3


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    Yes. For one example, a sufficiently high-energy gamma ray photon can under the right circumstances give up its energy to form an electron and an anti-electron. For another, high-energy collisions in particle accelerators routinely generate sprays of interesting particles of various masses.
  5. Jun 24, 2013 #4


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    And there's another way. A hot object has a very tiny amount of extra mass compared to an identical cold object. So you can create mass just by supplying heat energy to an object.
  6. Jun 24, 2013 #5
    Is there yet another?Does a compressed spring have more mass than an identical one that is not.
  7. Jun 24, 2013 #6


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    It does indeed.
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