Answer:
It is the amount of matter in the object.
Step-by-step explanation:
It is the amount of matter in the object, in physics mass is how much matter is there on an objet, the volume depends of how much does this matter occupies on the space, and the weight is the force with which the object is pulled into the gravitational force of the planet or space where the object is, for example, in space since there´s no gravitational foce, all objects weight the same. But all objects have mass, and have an amount of matter in them.