Physical properties of materials and systems can ofen be categorized as being either intensive or extensive, according to how the property changes with size (or extent) of the systems changes.
系统整体性质，子系统的加和是系统的量。
系统分布性质，均匀系统的强度量具有传递性，子系统的强度量应相同。one whose magnitude is independent of the size of the system.
热力学的这个分类建立在平衡态的前提下。