They can describe matter lots of different ways. Right now 6th graders in Russo’s science class are learning about weight and how it is different from mass. Mass is a measure of how much stuff is in an object and weight is the force that object applys due to the force of gravity. Change gravity and the force changes… but the mass will stay the same no matter where you are.
Later on, we dive into volume and then the biggie… density.
–Russo