In toxicology,<unk>  or<unk> '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<unk>  in the early 1900s.
Haber's rule
Javal's rule
Köllner's rule
Clark's rule
Goodsall's rule
Westgard rules
Eichler's rule
Reed's rules