Why does the density of a substance stay constant even if the mass of the substance increases?

What is avogadro’s number, and why is it useful

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.