Haber's rule
Toxicology relationship between the concentration of a poisonous gas and duration breathed / From Wikipedia, the free encyclopedia
In toxicology, Haber's rule or Haber's law is a mathematical statement of the relationship between the concentration of a poisonous gas and how long the gas must be breathed to produce death, or other toxic effect. The rule was formulated by German chemist Fritz Haber in the early 1900s.