Graham's law
noun
Gra·ham's law
| \ ˈgrā-əmz-
, ˈgra(-ə)mz-
\
, ˈgra(-ə)mz-
\
Medical Definition of Graham's law
: a statement in chemistry: under constant pressure and temperature two gases diffuse into each other at rates inversely proportional to the square roots of their respective molecular weights or densities