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AcousticsdB(SPL) - dB (Sound Pressure Level) — for sound in air and other gases, relative to 20 micropascals (μPa) = 2×10−5 Pa, the quietest sound a human can hear. This is roughly the sound of a mosquito flying 3 metres away. This is often abbreviated to just "dB", which gives some the erroneous notion that "dB" is an absolute unit by itself. For sound in water and other liquids, a reference pressure of 1 μPa is used. dB SIL - dB Sound Intensity Level — relative to 10−12 W/m2, which is roughly the threshold of human hearing in air. dB SWL - dB Sound Power Level — relative to 10−12 W.