Step 1 - Understanding the definition of each term
Mass: it measures the amount of matter of a body
Volume: it measures the space occupied by a body
Density: it's the mass divided by the volume
Weight: it is an indirect measure of the mass, since it also includes the action of gravity
Step 2 - Answering the exercise
As we can see, the definition that fits what is being asked is volume.
Answer: volume
