Bogus math 

In the "Power quantities" section, what's the point of asserting "Lp = 0.5*ln(P/Po) = 10*Log(P/Po)" when it is true only for the degenerative case: P == Po? Also, why term "Po" as "reference power"? "P" & "Po" should be "P1" & "P2" (that is, any arbitrary power measurements). Likewise for the "Field quantities" section.