GrotthussāDraper law
Quick Summary
The Grotthuss-Draper law states that radiation can only cause photochemical action if the substance affected absorbs its energy. This principle is fundamental to understanding chemical reactions initiated by light.12
In essence, for any photochemical process to occur, the light's energy must be absorbed by the substance involved. This law, named after Theodor von Grotthuss and John W. Draper, highlights the necessity of energy absorption for light-induced chemical changes. It is closely related to the photochemical equivalence law, which specifies that one molecule reacts for every quantum of radiation absorbed.12
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