...in chemical reactions.Psst. I know you did poorly in your science classes but there is a scientific law called "The Law of Conservation of Mass" which states that matter cannot be created nor destroyed.
Relativity breaks it, quantum physics breaks it, matter/antimatter reactions break it, it's only a rule of thumb, like how the law of universal gravitation is only a rule of thumb. The big bang theory itself requires matter to be created from energy.
What we do have though is the law of mass/energy conservation which always holds as far as anyone is concerned.
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