1. The problem statement, all variables and given/known data The speed v of sound waves in air depends on the atmospheric presure P and density. By using the method of dimensional analysis, find an expression for v in terms of P and density. 2. Relevant equations What I have so far; V= density x P I found a textbook which said that M can be ignored, as such...I end up getting [L][T^-2]=[M^x+y] [T^-2x] M---> 0 = x +y y = x L---> 1= -1x-3y T---> T-1= -1 T = 0 It must be obvious by now that I am missing a key concept here...any help would be appricated!