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Le décibel désigne une unité de mesure servant à exprimer une puissance sonore. Son symbole est dB, sans point abréviatif.
- On a réduit le niveau sonore d’un décibel.
- En acoustique, la force d’un son se mesure en décibel.
- Les gouttes de pluie ont un son très léger de 40 dB.
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