Eli5: What does helium being lighter than air have to do with making our voice higher pitched?
In: Physics
Helium is less dense than than air which makes soundwaves travel through it faster which “thins out” the wave making the pitch higher. The opposite effect happens with sulfur hexafluoride which is much denser than air “thickening” the wave which causes lower pitch.
Demonstrative clip: https://youtu.be/52UAEQfMTtU
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