质量是物质最基本的属性之一。正如我们熟知的,在历史上出现过“惯性质量”(牛顿第二定律 f=ma)和“引力质量”(万有引力定律 f=k((m_1·m_2)/r~2))两个质量概念。并且实验已经告诉我们“惯性质量”和“引力质量”是同一物理量——质量——的不同表现。由以上关于我们认识“质量”这一物理量的历史过程不难看出,物体在量的方面的差别是我们从物体在相同外界条件作用下运动状态发生不同的变化,或对 Quality is one of the most basic attributes of a substance. As we are familiar with, there have been “inertial masses” (Newton’s second law f=ma) and “gravitational masses” (the law of universal gravitation f=k((m_1·m_2)/r~2) in history. Two quality concepts. And experiments have shown us that “inertial mass” and “gravity quality” are different manifestations of the same physical quantity - quality. It is not difficult to see from the above history process that we know the physical quantity of “mass”. The difference in the amount of objects is that we have different changes in the state of motion of objects from the same external conditions, or