Why does inhaling helium make your voice higher?

Question

Why does inhaling helium make your voice higher?

Answer 1

I dont know, but it sure is fun!!

Answer 2

just reading about this the other night ,apparently in the 18th century helium when first discovered became the drug of choice for youngsters a bit like cannabis these days, there were quite a few recorded deaths from over use

Answer 3

Helium is less dense than air which lets the vocal cords vibrate faster thus producing higher pitched sounds.