ELi5 How come increasing volume doesn’t affect mass?

Question

How come increasing volume doesn’t affect mass?
So I understand mass isn’t weight, mass is the amount of matter in an object

In: Chemistry

Answer 1

~~Can you give me an example when it doesn’t affect mass? Unless the mass is 0, increasing the volume will increase its mass. Are you talking about density?~~

Edit: Well, I need to take a sleep