Question

define mass. the weight of an object in a vacuum. the amount of matter in an object. the density of an object compared to water. the volume of an object measured in liters.

Explanation:

Mass is a fundamental physical property that quantifies the amount of matter in an object. Weight is related to the force of gravity acting on an object, density is mass - per - volume, and volume is the amount of space an object occupies.

Answer:

The amount of matter in an object.