WAV - expansion for multimedia-files, recorded in format WAVE. Sound - in a broad sense - wave, mechanical fluctuations of air or other elastic environment; in narrow sense - subjective perception of these fluctuations by a special sense organ of the person and animals. It is considered that the person hears sounds in a range from 16 Hz up to 20 000 Hz (in other words the molecule of air makes from 16 up to 20000 fluctuations in a second). A sound below a range of audibility of the person name an infrasound, above up to 1 MHz - ultrasound, from 1 MHz up to 10 G - a hypersound.

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