What is the SI unit to measure sound?

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Sound is a phenomenon and it has no single unit. It carries various properties. It can be considered as a sound wave, which is described in terms of wavelength ( SI unit of wavelength is lambda). Similarly like frequency (heartz) , velocity (m/s)
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Decibel (db)
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Experties in mathmatics

decibal is SI unit to measure sound
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labhome

decibel
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Decibel (db) is the SI unit to measure sound .
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