Originally Posted by Merchant
Actually, you might be...
Speed of sound in air is only linked to temperature. Speed of sound in other mediums is a whole load more complicated!
Interesting but superficial. Just because the author of this piece says ignore altitude doesn't mean he is literally correct. You ignore altitude because you are using Rho, air pressure. The reason that altitude has an effect is because of the change it has on Rho. If you have already measure Rho then the altitude that Rho is measured at is irrelevent.
If you don't have Rho, and are making a calculation, then you will need the altitude to be able to make it.
http://en.wikipedia.org/wiki/Density_of_air
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