What is the measurement of an item's resistance to gravity called?

The measurement of an item's resistance to gravity is called weight. Weight is defined as the force exerted on an object due to gravity, typically measured in units such as pounds or kilograms. It represents how heavy an object feels and can vary depending on the gravitational field in which the object is located.

In contrast, mass is a measure of the amount of matter in an object and remains constant regardless of the gravitational force acting upon it. Densitometry relates to measuring density, which is mass per unit volume, while volume itself refers to the space that an object occupies. These concepts are distinct from weight, which specifically addresses the force of gravity acting on an object's mass. Understanding these definitions helps to clarify the properties of matter and their interactions in different environments.