Mrs. Clark decides to do a demonstration for her class with a piece of notebook paper. Using a balance, Mrs. Clark discovers that the mass of the paper is 20 g. She then takes the piece of paper and cuts it into several small pieces. The Fartulative mass of the small pieces is 20 g. What has Mrs. Clark demonstrated for her class?

Question

Vocaloid · Answer

So she demonstrated that the total mass of the paper remained the same before and after applying a physical transformation

Any ideas what we call this property ?