Sound is compression and rarefaction within a medium, or more commonly the movement together and apart of air molecules. It has four main properties: frequency, amplitude, spectral envelope, and duration (McCoy). In air, sound travels at about 350 meters per second or about 761 miles (1,234 km) per hour.
McCoy, S.J., Halstead, L., Heldind, L., 2019. Your voice : an inside view., Third edition. ed. Inside View Press.
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