An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

Homepage  Preliminaries  Abbreviations  Acknowledgments  References 
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Wiedemann-Franz law
  قانون ِ ویدمن-فرانتس  
qânun-e Wiedemann-Franz
Fr.: loi Wiedemann-Franz  

For all metals the ratio of the → thermal conductivity, κ, to the → electrical conductivity,
σ, is directly proportional to the absolute temperature: K/σ = (1/3)(πk/e)2T, where k is → Boltzmann’s constant and e the electron’s charge.

See also: Named after the German physicists Gustav Heinrich Wiedemann (1826-1899) and Rudolph Franz (1826-1902); → law.