There are many books that refer to this phenomenon as the Tyndall phenomenon*. When a large number of small particles are present in a homogeneous, transparent medium, the light beam incident on it is scattered by the particles, making it possible to observe the path of the light beam from a direction other than that of the incident light. This is why the path of light becomes visible when a thin beam of light is shone on a colloidal solution. This is called the Tyndall phenomenon, or Tyndall effect*, and a quantitative treatment of it was given by Lord Rayleigh. See also Rayleigh scattering*. Tyndall demonstrated that this scattering effect does not occur in human breath, which provided support for Pasteur's theory. See Julius Komlow, The Story of a Discovery that Changed Medicine, translated by Suwa Kunio (Chugai Igakusha), among others. Source: Asakura Publishing Dictionary of Laws Information |
チンダル現象*と記してある書物も少なくない.均一で透明な媒質中多数の小さな粒子が存在している場合,これに入射した光線は粒子により散乱を受け,入射光とは別な方向からも光線の通路を観察することが可能となる.コロイド溶液に細い光のビームを当てたとき,光路がみえるのはこのためである.これが,ティンダル現象,または,ティンダル効果*と呼ばれるもので,定量的な扱いはレイリー卿により与えられた.レイリー散乱*も参照.なお,ティンダルはヒトの呼気にはこの散乱効果がみられないことを示し,これからパストゥールの理論の裏づけを行った.ジュリアス・コムロウ『医学を変えた発見の物語』諏訪邦夫訳(中外医学社)などを参照.
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