There exist other common definitions of mass including active gravitational mass and passive gravitational mass. While many different units are used to describe mass throughout the world, the standard unit of mass under the International System of Units (SI) is the kilogram (kg). An inflated balloon, for example, would have significantly less mass than a golf ball made of silver. The amount of mass that an object has is often correlated with its size, but objects with larger volumes do not always have more mass. In classical physics, matter is any substance that has mass and volume. Matter, however, is somewhat loosely defined in science, and cannot be precisely measured. It is most commonly measured as inertial mass, involving an object's resistance to acceleration given some net force.
Mass is typically defined as the amount of matter within an object.
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