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What is decibel?

Decibel is a measure of the loudness or the intensity of a sound. It is measured by taking the log of two ratios. It is measured on a logarithmic scale to provide numbers that are more manageable. 0 dB is the quietest sound and the rise in every 3dB describes the doubling of the amplitude.

Examples of sound labels:

1. Near-total silence - 0 dB
2. A whisper - 15 dB
3. Normal conversation - 60 dB
4. A lawnmower - 90 dB
5. A car horn - 110 dB
6. A rock concert or a jet engine - 120 dB
7. A gunshot or firecracker - 140 dB