质量守恒定律作为一条基本的自然规律,揭示的是化学变化前后物质之间质量关系的规律。其实质是在化学反应前后元素的种类不变,原子的种类、原子的个数、原子的质量也不变。因此,在宏观上体现出化学反应前后物质的总质量不变。 The law of conservation of mass, as a basic natural law, reveals the law of the quality relationship between matter before and after chemical change. The essence of this is that the type of the element does not change before and after the chemical reaction, and the type of atom, the number of atoms, and the mass of the atom also do not change. Therefore, the overall mass of the material before and after the chemical reaction is reflected in the macroscopically.