Rudolf Julius (ˈruːdɔlf ˈjuːliʊs). 1822–88, German physicist and mathematician. He enunciated the second law of thermodynamics (1850) and developed the kinetic theory of gases
Clausius in American English
(ˈklauziəs)
noun
Rudolf Julius Emanuel (ˈruːdɑlf ˈdʒuːljəs ɪˈmænjuːəl, German ˈʀuːdɔlf ˈjuːliˌus eiˈmɑːnuːˌel), 1822–88, German mathematical physicist: pioneer in the field of thermodynamics