Why is it difficult to prove the Law of Conservation of Mass when a
gas is produced?

Which is true of a liquid? it has a definite volume but not a definite mass.it has a definite mass but not a definite volume.it has a definite volume but not a definite shape.it has a definite shape but not a definite volume.

Most metamorphosis processes take place

The same side of the moon always faces earth because the