Quote:
Originally Posted by Diopos
Ahh. We're getting dirty aren't we?! 
Relativistically speaking you are correct. Mass is a measure of inertia rather than amount of substance. But when you wrote: "Not really, in any reaction no matter is created or destroyed" you were actually using a phrase directly pointing to the "conservation of mass law" as formulated by Antoine Lavoisier. Back then the universe was Newtonian and matter mattered!!! 
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Ahhh, Antoine Lavoisier! That was the guy I was thinking of but couldn't remember his name. He was put to death during the French Revolution and his wife took over his quest to study matter IIRC.