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.
In the Wimbledon finals this weekend, two of the older players on tour have a shot at winning titles. Serena Williams, who is 33 years old, will play 21-year-old Garbine Muguruza on Saturday in the womenâs final. And on Sunday, Roger Federer, who is also 33, will play 28-year-old Novak Djokovic. In the Open era, 33 has historically been pretty old to be near the top of the rankings.