Snapping (or clicking) one's fingers is the act of creating a cracking/clicking sound with one's fingers by building tension between the thumb and another (middle, index, or ring) finger, and then moving the other finger so it hits the palm of one's hand at a high speed.
The sound of the snap is created as a result of one of the fingers coming into contact with the groove between a second finger and the palm, thus forcing the air out with an audible crack which resonates in the curved shape of the palm. [1]
When used purposefully, the snapping of the fingers can secure an individual's or an animal's attention.
The sound is not caused by the friction from the fingers rubbing together. That sound can be heard briefly before the snap, as a whisking sound.[1]
References
- ^ a b "Snapping Fingers" at NEWTON/Ask A Scientist
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