Grotthus Law

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Grotthus’ Law


the first law of photochemistry, which states that chemical reaction in a substance can be brought about by the absorbed part of the incident light only. First stated by K. Grotthus in 1818 on the basis of theoretical considerations. The position was supported experimentally by J. Herschel in 1842 and J. Draper in 1843. (It is also called the Grotthus-Draper law.) The Grotthus law was very important as the precursor of the law of photochemical equivalence, discovered by A. Einstein in 1912–13.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.