物理学中有许多物理量是用另外两个量的比值来定义的,比如电场强度 E=U/d、电势差 U_(AB)=W/q、电容量 C=Q/U 等.比值定义法 C=A/B 会所定义的物理量 C,其大小虽然可以通过量 A 和 B 的比值计算出来,但量 C 并不由 A 和 B 来决定,而且量 C 与 A 和 B 是否存在都无关系,例如电容器的电容量 C 可以用比值 Q/U Many physical quantities in physics are defined by the ratio of two other quantities, such as electric field strength E=U/d, potential difference U_(AB)=W/q, capacitance C=Q/U, etc. Ratio Definition Method C =A/B The physical quantity C defined by the clubhouse, although its size can be calculated by the ratio of the quantity A and B, but the quantity C is not determined by A and B, and the quantity C has nothing to do with the existence of A and B, such as capacitor The capacity C can be used with ratio Q/U