Besides clapping your hands and snapping your fingers, there is another way to make sounds with your hands. The approach I show in the video below exploits the facts that the palms of your hands are concave, and that when you place your hands opposite to each other and introduce a slight twist, the area around your palms acts like a seal turning both of your hands into suctions cups. Once you have arranged your hands in this position, you can press them against each other forcing out the air between them which will make a sound. The expelling of the air will create a low pressure area (not a vacuum, see below) between your hands, and when you break the seal, the air will rush back in and produce another sound. By pressing and releasing your hands repeatedly against each other you can rapidly produce rhythmical sounds.
It is important to understand that the reason air rushes in when you break the seal is not that the air is “sucked in” by the vacuum in between your hands. As I have explained in my blog, vacuums don’t suck; it is the atmosphere that pushes. A column of air hundreds of miles high above you excerpts a pressure of 14.7 pounds per square inch (at sea level) on your hands. When you move your hands or fingers and break the seal, it is all that pressure that pushes the air back in.
While clapping hands and snapping fingers are well known descriptions of how to make sounds with your hands, I don’t know what word to use to describe the method that I used in the video to produce sounds with my hands. If you know or want to suggest (or invent) a verb for it, please leave a comment below!