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Originally Posted by Amano
Well Energy itself doesn't have mass per se , but as the first link points out, it is possible under certain circumstances to interconvert mass and energy. That's where E=mc^2 comes in.
When the US was testing out its atom bombs in WW2, they showed that some mass was lost, and transformed into energy (just a little, not all the energy of the bomb). They did the calculations and the data fit E=mc^2 rather well
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As I have said before mass must be conserved, so if it is possible to convert matter into energy then it
must follow that the energy released has mass. Yes, it
per se has mass. The testing by the US would have found out that some
matter was converted to energy, instead of showing a mass loss and refuting basic concepts of thermodynamics.