主要差异–振幅与幅度

振幅和幅度都是用来描述量的性质的术语。振幅和幅值之间的主要区别在于，振幅指的是一个量可以从0取的最远值，而幅值指的是一个量的大小，而与方向无关。

什么是振幅(amplitude)？

The term amplitude describes the maximum and minimum values reached by a periodically changing quantity. Typically, the term is used with quantities that vary sinusoidally. In this context, amplitude refers to the maximum deviation from the equilibrium. i.e. if the quantity  can be described with an equation in the form of , then is the amplitude. The diagram below illustrates this:

For a sinusoidally-varying quantity, the amplitude refers to the maximum and minimum values taken by the quantity.

When the amplitude of a wave is proportional to the wave’s energy, the intensity of the wave (that is, the power tran**itted by the wave per unit area) is proportional to the square of its amplitude. When we describe simple harmonic motion, amplitude refers to the maximum displacement of the oscillating object from the equilibrium position.

什么是震级(magnitude)？

Magnitude refers to the size of a quantity, regardless of the quantity’s direction (if the quantity has one). For a vector of  dimensi*** , the magnitude  is given by:

由于没有方向与量值相关联，所以矢量量的量值是标量。例如，位移的大小是距离，速度的大小是速度，两者都是标量。

星等也是天文学中用来测量天体亮度的单位。地震是用里彻尺度上的“震级”来描述的。

振幅(amplitude)和震级(magnitude)的区别

振幅是指一个周期性变化的量所能获得的与零的最大偏差。

量值是指一个量的大小，与方向无关。