When lifting an object against gravity, what physical property are you measuring?

When lifting an object against gravity, you are measuring its weight. Weight is defined as the force exerted on an object due to gravity. It is calculated as the product of the object's mass and the acceleration due to gravity. Therefore, when you lift an object, the force you must exert to overcome gravitational pull is equal to its weight.

Mass represents the amount of matter in an object and is a scalar quantity, meaning it does not change regardless of the object's location in a gravitational field. Volume is a measure of the space the object occupies and is unrelated to the force experienced while lifting. Inertia refers to an object's resistance to changes in its state of motion, which is related to mass but not to the force required to lift the object against gravitational pull. Thus, lifting an object involves overcoming its weight, making that the correct answer.