Grotthuss-Draper law
noun
Grott·huss-Dra·per law
ˈgrȯt|ˌhu̇s|ˈdrāpə(r)-,
ˈgrät|,
|ˌhüs|
: a statement in physical chemistry: radiation produces photochemical action only through absorption of its energy by the substance affected
Word History
Etymology
after Theodor von Grotthuss †1822 German physicist and John W. Draper †1882 American chemist