A Logarithmic Scale
The Decibel (dB) isn't a linear unit like an inch. Every 10 dB increase represents a 10-fold increase in sound intensity and a perceived doubling of loudness.
Common Sound Levels
- 0 dB: Threshold of human hearing
- 60 dB: Normal conversation
- 120 dB: Chainsaw / Rock concert (Pain threshold)
- 140 dB: Jet engine at takeoff
Hearing Protection
Repeated exposure to sounds above 85 dB can cause permanent hearing loss. This is why construction workers and musicians use earplugs.
Key Takeaways
- 110 dB is 100 times more intense than 90 dB
- Distance reduces sound—every doubling of distance drops sound by 6 dB
- "Silent" rooms are usually around 20-30 dB