Quote:
Originally Posted by Diopos
Mass is "destroyed" or "created" all the time producing or expending equivalent amounts of energy. E=mc˛ and all that. It's the sum of mass and energy that remains constant. Atomic bomb anyone? BUT in systems where you don't have nuclear reactions or sub atomic particle """transformations""" mass is preserved ... pending further investigation 
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But mass is not matter. You can add mass by increasing speed but the matter in an object does not increase.