Difference Between Amplitude and Magnitude
Main Difference – Amplitude vs. Magnitude
Amplitude and magnitude are both terms used to describe properties of quantities. The main difference between amplitude and magnitude is that amplitude refers to the furthest values that a quantity can take from 0 whereas magnitude refers to the size of a quantity regardless of direction.
振幅和幅度都是用来描述量的性质的术语。amplitude和magnitude之间的主要区别是amplitude是指一个量从0取的最远的值，而magnitude 是指一个量的大小，而与方向无关。
What is 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 x can be described with an equation in the form of x(t)=A\mathrm{sin:}2\pi ft, then A is the amplitude. The diagram below illustrates this:
amplitude这个术语描述了周期性变化的量所达到的最大值和最小值。通常，这个术语用在正弦变化的量上。在这种情况下，amplitude是指与平衡的最大偏差。即，如果量x可以用x(t)=A\mathrm{sin:}2\pi ft形式的方程来描述，那么A就是振幅。下图说明了这一点:
What is Magnitude
Magnitude指的是一个量的大小，与方向无关，例子如下：
Since no direction is associated with a magnitude, the magnitudes of vector quantities are scalar quantities. For instance, the magnitude of displacement is the distance, and the magnitude of velocity is speed, both of which are scalars.
由于没有方向与大小相关，所以矢量的大小是标量。例如，位移的大小是距离，速度的大小是速度，两者都是标量。
Magnitude is also the of a unit in astronomy that measures the brightness of astronomical objects. Earthquakes are described using “magnitudes” along the Ritcher scale.
Magnitude也是天文学中测量天体亮度的单位。地震是用里氏震级来描述的。
Difference Between Amplitude and Magnitude
Amplitude refers to the maximum deviation from zero that can be taken by a periodically varying quantity.
Magnitude refers to the size of a quantity regardless of the direction.
Amplitude是指一个周期变化的量可以从零到零的最大偏差。
Magnitude是指一个量的大小，与方向无关。