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好多物理定律内容以比例关系阐述,用比例式子表达,在由比例式转化为等式的过程中,伴随着比例量的产生。在物理学中,许多比例量称为常量与恒量。那末,常量与恒量有没有区别呢? 常量是在某些条件下保持不变的量。常量中有的是纯粹的数,如:圆周率π=3.14159……,又称常数;有的是既有量值,又有单位的量,它反映一个量的变化与另一些量的变化之间的关系。故又称为系数,如:电阻定律表达式:R=ρl/S中的电阻单ρ;胡克定律F=kx中的倔强系数k等。常数往往不受物理环境、条件和物体性质
Many contents of the laws of physics are described in terms of proportionality and expressed in terms of proportional expressions. In the process of conversion from proportions to equations, proportional quantities are produced. In physics, many proportional quantities are called constants and constants. Then, is there a difference between a constant and a constant? A constant is a quantity that remains constant under certain conditions. Some of the constants are pure numbers, such as: pi = 3.14159 ..., also known as constants; some are existing quantities, and there are unit quantities, which reflect the relationship between changes in one quantity and changes in other quantities. It is also known as the coefficient, such as: resistance law expression: R = ρl / S in the resistance of single ρ; Hooke’s law F = kx in the stubby coefficient k and so on. Constants are often not affected by the physical environment, conditions, and properties of the object