The measure of the amount of matter in an object is called mass. Mass quantifies the substance of an object, determining how much matter it contains, regardless of its volume or shape. It is commonly measured in units such as grams or kilograms. Mass is an essential physical property in various scientific fields, affecting gravity's force on the object and its inertia. Unlike weight, which is influenced by gravitational pull, mass remains constant regardless of location, making it a fundamental measurement in physics and chemistry.