The sound of hands clapping is thanks to a Helmholtz resonator. That’s the same concept behind the sound made when you blow across the top of an empty bottle. A Helmholtz resonator consists of an enclosed pocket of air, connected to an opening by a neck. Air vibrates within the neck, creating sound waves. When a person claps, an air pocket is formed within the palms. A jet of air streams out of a gap left between the thumb and forefinger, kicking off vibrations in the surrounding air. Researchers saw a similar effect using cup-shaped silicone models designed to mimic palms slapping together.
Credit to : Science News
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