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The decibel scale is a logarithmic scale. Scroll down to related links and look at "Decibel - Wikipedia" and "Sound level meter - Wikipedia".
-- The shoreline of any coastal land is a fractal. -- The distant view of any mountain range is a fractal. -- Your eyes perceive changes in light brightness on a logarithmic scale. -- Your ears perceive changes in sound loudness on a logarithmic scale.
Most famous is a SPL meter (Sound Pressure Level).
Speed of sound.
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