What concept refers to the measure between two forces of gravity?

The concept that refers to the measure between two forces of gravity is weight. Weight is defined as the gravitational force acting on an object, influenced by both the mass of the object and the acceleration due to gravity. Thus, when considering how gravity affects an object, weight quantifies that force.

In contrast, mass is a measure of the amount of matter in an object and does not change regardless of location, whereas density relates to the mass divided by volume, giving a sense of how compact an object's mass is. Volume measures the amount of space an object occupies but does not directly correlate with gravitational forces. Therefore, weight is the appropriate term to describe the force exerted by gravity on an object.