A liter of water weighs a kilogram so 15 mg/kg = 15 ppm on a mass over mass basis. If that is the flavor of ppm you want, done. But ppm can also be computed on a volume basis, molar ratio, etc. It is better tio use a clear form with units that identifies the basis such as mg/kg.
Serena Williams knocked off Lucie Safarova in the final of the women's draw at the French Open, and Bovada has her listed as the clear favorite on the odds to win Wimbledon this year; Williams sits as the 7/4 chalk on those betting lines.
Billie Jean won for all women. By Larry Schwartz. Special to ESPN.com. Billie Jean King won six Wimbledon singles championships and four U.S. Open titles. She was ranked No. 1 in the world five years. She defeated such magnificent players as Martina Navratilova, Chris Evert and Margaret Court. It isn't a reach to say that Billie Jean King has done the most for women in their fight for equality in sports. Yet of all her matches, the one that is remembered most is her victory against a 55-year-old man. History has recorded all King accomplished in furthering the cause of women's struggle for equality in the 1970s.