This law states that the amount of a substance that undergoes a photochemical reaction is proportional to the intensity of light absorbed by the substance and the duration of exposure. A qualitative statement that only light absorbed by a substance can cause a photochemical reaction was presented by T. Gross in 1820 and J. Draper in 1845, but in 1857 German chemists R. Bunsen and H. Roscoe discovered a quantitative version. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
光化学反応を起す物質の量は,物質に吸収された光の強さと照射時間に比例するという法則。 1820年に T.グロッス,45年に J.ドレーパーによって,物質に吸収された光のみが光化学反応を起しうるという定性的表現が提示されていたが,57年ドイツの化学者 R.ブンゼンと H.ロスコーが定量的に見出した。
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