: The scale is not linear. An increase of 10 dB represents a 10-fold increase in sound intensity and roughly a doubling of perceived loudness.
Because the scale is logarithmic, you cannot simply add decibel numbers together. Decibel
: A decibel always requires a reference point. In acoustics ( dB SPL ), the reference is : The scale is not linear
: Named after Alexander Graham Bell, a decibel is literally one-tenth of a "Bel". The Bel itself was found to be too large for common precision. : A decibel always requires a reference point
The is a logarithmic unit used to express the ratio between two values, most commonly sound intensity or electrical power. Unlike linear scales (like inches or pounds), the decibel scale compresses vast ranges of numbers into manageable figures, reflecting how human senses—specifically hearing—actually perceive change. Core Concepts
: Many free apps are available on the Google Play Store or Apple App Store. While convenient for general checks, they may lack the calibration required for official evidence.
: If one sound is significantly louder than another (by 10 dB or more), the quieter sound barely affects the total decibel reading. Measuring Decibels