clausius

noun

1. Ru·dolf Jul·ius E·man·u·el [roo-dolf jool-yuh s i-man-yoo-uh l; German roo-dawlf yoo-lee-oo s ey-mah-noo-el] /ˈru dɒlf ˈdʒul yəs ɪˈmæn yu əl; German ˈru dɔlf ˈyu liˌʊs eɪˈmɑ nuˌɛl/, 1822–88, German mathematical physicist: pioneer in the field of thermodynamics.

noun

1. 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