In one of the articles in Arabic I read that the law of conservation of energy and matter is wrong. Is this true? I was confused when hearing this. What I know is that there is a law in physics that says that energy and matter do not perish and do not come from nothing. Is this true or is this law not valid anymore?
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Possible duplicates: https://physics.stackexchange.com/q/19216/2451 and links therein. – Qmechanic Jun 27 '21 at 14:01
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If by matter you mean mass, mass is conserved only in classical mechanics and electrodynamics. For high velocities and energies one has to use Lorenz transformations to define the kinematics http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/ltrans.html . Mass is not an additive conserved quantity but depends or the length of the four vectors. Only energy momentum and angular momentum are conserved quantities in this frame.. – anna v Jun 27 '21 at 14:09