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Frae Wikipedia, the free beuk o knawledge

Soond is a waw that is a swaw o pressur transmittit throu a solit, liquid, gas, or plasma made o haurable frequencies. Humans ordinar hear soonds atween 20 Hz an 20 kHz. Bi uisin soond, baests cans hear pheesical phenomena an syne get tae sauftie. Forby, gleg baests like humans uise soond for tae communicate in leids.