How Fast Is Human Whistle?

Air exits a human whistle at about 12 m/s — fast enough that tongue-positioned resonance produces tones in the audible range. Whistled languages exist in mountain communities worldwide, used to communicate across kilometres of rugged terrain.

Whistled languages exist in mountain communities worldwide — used to communicate across kilometres where shouting can't reach.

• Faster than a champagne cork
• Whistled languages communicate across kilometres