Jazzy and others -that table most definitely does not "tell all". It's just a list of standard numbers for the atmosphere. Each column is a list of increasing or decreasing numbers. That doesn't mean there is a direct relationship between one particular column and another.

If you can infer a relationship between SoS and density from that list, then I can just as easily asume SoS is related to pressure - and neither would be right. The only true physical relationship has been shown thru experimentation to be between Sos and temp. Any other assumptions I have seen here seem to be based on "common sense" feelings rather than science.