Answer: Mass
Explanation:-
Density is defined as the mass contained per unit volume. [tex]Density=\frac{mass}{volume}[/tex]
Volume is the space occupied by a substance.
Mass is the amount of matter contained in a body.
Weight of an object is the force acting on an object by virtue of its mass.
weight=[tex]mass\times acceleratio[/tex]
Thus amount of matter refers to mass of matter.
