Frederick George Keyes (June 24, 1885 – April 14, 1976) was an American physical chemist.[1][2] Keyes was most notable for inventing a method to sterilize milk using ultraviolet rays, and discovering that ultraviolet rays kill germs.[3] According to the National Academies Press, Keyes was also notable for "advances in thermodynamics, equations of state of gases, and thermodynamic properties, in particular liquid water and steam".[2]