An extensive property is a property that depends on the amount of substance present. Because its value scales with quantity, an extensive property cannot by itself be used to identify a substance. Mass, length, and volume are extensive properties, whereas an intensive property such as density does not depend on amount.

广延性质是与物质的量有关的性质。由于其数值随量的多少而变化,广延性质本身不能用来鉴别物质。质量、长度和体积都是广延性质;而像密度这样的强度性质则与量无关。