can mass be created from energy?
Not by humans, AFAIK.
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.
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.
Is there yet another?Does a compressed spring have more mass than an identical one that is not.
It does indeed.
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