Otto Sackur was a German physical chemist.

He is known for the development of the Sackur-Tetrode equation

Sackur-Tetrode equation

The Sackur–Tetrode equation is an expression for the entropy of a monatomic classical ideal gas which incorporates quantum considerations which give a more detailed description of its regime of validity....

 which he developed independently of Hugo Tetrode

Hugo Tetrode

Hugo Martin Tetrode was a Dutch theoretical physicist who contributed to statistical physics, early quantum theory and quantum mechanics....

Sackur studied at the University of Breslau, and received his doctorate there in 1901. He worked in London before joining the Fritz Haber institute in Berlin. He died in an explosion after mixing two chemicals.