Question

which expression best defines the term mass? the mass per unit volume of a material a measurement of the quantity of matter in an object anything that takes up space anything that takes up space and has mass

Explanation:

Mass is defined as the quantity of matter in an object. Anything that takes up space and has mass is matter, but that's a definition of matter not mass. The mass per unit volume is density.

Answer:

a measurement of the quantity of matter in an object