Mass is the measure of the quantity of matter in an object, determined by the types and number of atoms it contains, and remains constant regardless of the object's location or gravitational pull.
Mass is the quantity of matter an object contains and is measured by its resistance to acceleration. One can think of it as the amount of 'stuff' in an object, determined by the number and types of atoms it contains. For example, a kilogram of cotton balls has the same mass as a kilogram of gold. Unlike weight, mass is constant and does not change based on location or gravitational pull.
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