Why does helium make your voice sound higher?
Quick Answer
Helium changes the speed of sound in your vocal tract, which shifts the resonance frequencies upward. Your vocal cords do not vibrate much faster; the sound waves are just shaped differently.
The Full Story
Your voice sounds different in helium because helium is much less dense than air, so sound travels through it faster. When the sound in your throat and mouth speeds up, the resonant frequencies of the vocal tract increase, making your voice sound higher and squeakier. The pitch from your vocal cords changes little, but the formants—the acoustic resonances that shape speech—shift upward. The effect is temporary, but inhaling helium from unregulated sources can be dangerous because it can displace oxygen.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Why helium makes you sound like a cartoon character."
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