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How about a good dose of hypothyroidism! (seriously)
Thus to reduce the speed of sound further, you probably require a gas with a large number of atoms, and a high atomic weight....I would guess that most molecules that are heavy enough to have a speed of sound 1/3rd the speed of air when a gas, would probably be too heavy to be gaseous at STP.
Quote from: Karen W. on 20/09/2007 00:09:31How about a good dose of hypothyroidism! (seriously)Probably taking steroids would have the same effect.
So there would be some slight drop in frequency when breathing propane.
Would that mean that having too much alcohol (C2H5OH, MW 46) in your breath would lower the pitch of your voice ?