Unit of Sound

Sound is a very interesting topic to study, but there are a lot of terms and concepts that students will have to go through. A sound unit is any acoustic unit of sound measurement. Having said that, we are breaking down the concepts so that students can get a better grip and understand the topics clearly. As such, we will learn about the units of sound in this article.

Table of Contents:

What is the SI Unit of Sound?

Sound is another form of energy that travels in the form of waves either through a liquid, air, or even solid substances. Since this energy can be measured, the most common SI unit of sound that is used is Decibel which is abbreviated as dB.

  • This unit is basically used to express the ratio of some value of a physical property to another, mainly on a logarithmic scale. This is called as Decibel Scale or DB Scale.
  • Moreover, the unit can be used to express different reference pressures or intensity. However, students have to make note that the sound intensity given in dB in the air will be different from dB in water.

Other Sound Units

Some of the other sound units include:

  • sone
  • phon
  • Hertz (Hz)
  • watt per square meter (W/m2)

These units are used depending on what properties of sound we are dealing with. For example, sound intensity is measured in watt per square meter (W/m2).

You may also want to check out these topics given below!

Learn what is sound in detail, by seeing the video below.


Hope you have understood the SI unit of sound and other units of sound. Stay tuned with BYJU’S for more such interesting articles. Also, register to “BYJU’S – The Learning App” for loads of interactive, engaging Physics-related videos and unlimited academic assist.

Frequently Asked Questions – FAQs

What is meant by sound?

A sound is a form of energy that travels in the form of waves either through liquid, air, or even solid substances.

What is the SI unit of sound?

The SI unit of sound is decibel.

What are the other sound units?

Other sound units are:
  • Sone
  • Phon
  • Hertz (Hz)
  • Watt per square meter (W/m2)
  • Define decibel scale?

    Decibel scale is used to express the ratio of some value of a physical property to another, mainly on a logarithmic scale.

    State true or false: A sound unit is any acoustic unit of sound measurement.

    TRUE.

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