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Unit of Vibration

Vibration is a term that tends to induce the sound when someone hears it. Everything in the world vibrates invariably. Some vibrations are good and useful, some are tolerable while some fall under the dangerous category. One of the examples of good vibration is a vibrating guitar that produces good sound. The earthquake is the most dreaded vibration of all. In this article, we will be discussing vibration and the unit of vibration.

What is Vibration?

While vibration is not actually a physical quantity to have a unit, it is a form of a complex signal that describes a state of an object which experiences physical acceleration by various forces. Generally, vibrations occur when an object moves repetitively in a certain direction but at an equilibrium point. However, talking about the units of measurement, vibration is generally expressed by the units of Frequency, Velocity, Acceleration and Displacement which are denoted by letters f, v, a and d. This is also because if we look at it practically, vibration is more of an intricate summation of various frequencies at different amplitudes.

Vibration Units

So if we ask what is the unit of vibration, there is no single answer. Besides, as there are many factors to consider we have to break down the topic and understand a few things. Basically, there are several units that can be used depending on the properties of vibration. Following are the various units:

Frequency (f)

When we consider cycles per second or the number of times a repetitive motion is generated by a vibrating object usually in 1 second we use the unit of frequency which is Hertz (Hz).

Displacement (d)

If we talk about the amplitude (distance) between the peaks of vibration or the distance a vibrating object is displaced from a fixed position then the unit will be m, μm, and mm.


When the vibrating object reaches the maximum speed during the vibration cycle units like mm/s or cm/s are used to basically measure the changing rate of displacement (d) per unit time.


Defined as the changing rate of velocity(V) per unit time here. Vibration can be measured using m/s2, cm/s2, mm/s2.

Other Possible Units

Taking ‘vibration’ as Sound, the relevant SI unit would be watts per square meter (W/m2).

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