the weight of the object the volume of the object the amount of matter in the object the amount of gravitational pull on the object
I gave my students this multiple choice question: Which phrase best describes the mass of an object?

Only one answer is correct among these 4 choices:
- the weight of the object
- the volume of the object
- the amount of matter in the object
- the amount of gravitational pull on the object

Could you tell me which one is correct?

the amount of matter in the object