Answer:
In physics and chemistry, the law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.
Explanation:
That is what I think on the subject
A law is more specific, such as this particular description of matter, whereas a theory can be more general and often includes more of a why. Atomic Theory explains why the law of conservation of matter exists; in chemical reactions, atoms simply rearrange and have the same mass before and after.
A theory is a well-thought-out elaboration for natural-world anecdotes that has been built using the methodological approach and incorporates many facts and hypotheses.
A scientific law, in overall, is a description of an observed phenomenon. It does not explain why or what causes the phenomenon.
A scientific theory is an explanation for a concept. It is a common misconception that with enough research, theories can become laws.
A law is more precise, such as this detailed definition of matter, whereas a theory is more general and frequently includes more of a why.
Atomic Theory explains why the law of conservation of matter exists; atoms simply rearrange and have the same mass before and after chemical reactions.
Thus, that's why, the law of conservation of mass law and not a theory.
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