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'''Ludwig Eduard Boltzmann''' ({{IPA-de|ˈluːtvɪg ˈbɔlt͡sman}}; February 20, 1844 – September 5, 1906) was an [[Austria]]n [[physicist]] and [[philosopher]]. His greatest achievements were the development of [[statistical mechanics]], and the statistical explanation of the [[second law of thermodynamics]]. In 1877 he provided the current definition of [[entropy]], <math>S = k_{\rm B} \ln \Omega \!<math>, interpreted as a measure of statistical disorder of a system.<ref name="EncycloBritan">{{cite book  

'''Ludwig Eduard Boltzmann''' ({{IPA-de|ˈluːtvɪg ˈbɔlt͡sman}}; February 20, 1844 – September 5, 1906) was an [[Austria]]n [[physicist]] and [[philosopher]]. His greatest achievements were the development of [[statistical mechanics]], and the statistical explanation of the [[second law of thermodynamics]]. In 1877 he provided the current definition of [[entropy]],<math><math>S = k_{\rm B} \ln \Omega \!<math></math>, interpreted as a measure of statistical disorder of a system.<ref name="EncycloBritan">{{cite book  

|last1= Klein

|last1= Klein

|first1= Martin

|first1= Martin