Why Snapping Your Fingers Makes Such a Sharp Sound
The sound of a finger snap comes mainly from your middle finger striking your palm, with the skin and air helping turn that motion into a sharp pop.
Details
A finger snap sounds simple, but the sharp pop comes from a quick chain of physical events. When you press a finger against your thumb and then release it, the finger accelerates rapidly. The important impact is the finger striking the palm, which creates a sudden burst of vibration and pressure in the surrounding air. That fast impact is what gives the snap its crisp sound. The skin of the palm also plays an important part because it deforms and vibrates when the finger hits it, helping produce the sound that reaches your ears. The exact sound can vary with finger position, how hard the snap is made, and the shape and movement of the hand. So the familiar snap is not simply the sound of two fingers rubbing together. It is a small, very fast mechanical impact that turns motion into a brief burst of sound.
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