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Igor Belo · Answer 1 · 2016-10-23T05:54:00+0000

I think the correct question would be, how do you measure sound. :)
you measure sound by using amplitude. It measures how forceful the sound is.
Thats how you know whether its loud or quite :)

Manjot · Answer 2 · 2016-10-28T04:34:44+0000

There are several instruments used to measure loudness. Loudness's unit is "decibel". You can use a microphone and a software to measure loudness. For windows : Free Decibel Reader or Audacity.

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