What Is Sound?

To understand how hearing works, you first have to understand sound. Your hearing system is based solely on physical movement. An object produces sound when it vibrates in matter. This could be a solid, such as earth; a liquid, such as water; or a gas, such as air. Most of the time, we hear sounds traveling through the air in our atmosphere.

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• Near total silence – 0 dB
• A whisper – 15 dB
• Hotel lobby conversation 40-45 dB
• Normal conversation – 60 dB
• A lawnmower – 90 dB
• Thunder – 100 dB
• A car horn – 110 dB
• A rock concert or a jet engine – 120 dB
• A gunshot or firecracker – 140 dB

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