我们知道一粒芝麻的质量是很小的,尽管芝麻是宏观物体而不是微观粒子,可是用托盘天平也难以称量它1粒的质量,而称量100粒或者大量芝麻的质量是极易办到的.所以,科学上用“物质的量”这个物理量把一定数目的原子、分子或离子等微观粒子与可称量的物质联系起来.“物质 We know that the quality of a grain of sesame is very small. Although sesame is a macroscopic object rather than a microscopic particle, it is difficult to weigh the mass of 1 grain with a tray balance, and weighing 100 grains or a large amount of sesame is very easy to do. Therefore, scientifically, the physical quantity “quantity” is used to associate a certain number of microscopic particles such as atoms, molecules or ions with weighable substances.