Submitted by awwfuckme t3_10inngf in explainlikeimfive
Phage0070 t1_j5fc7io wrote
Sounds are vibrations in air, which can be thought of as waves of varying pressure. Air can only be one pressure at a given time and place, which means that multiple sound frequencies merge together through something called "interference". There can be destructive interference where a peak of a wave encounters the trough of another and cancel each other out to some extent, or constructive interference where two peaks or two troughs encounter each other and combine to form a higher peak or deeper trough.
Multiple sound frequencies then all combine to form one complex sound wave which a speaker can then produce.
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