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Karol Stanisław Olszewski (Polish pronunciation: ; 29 January 1846 – 24 March 1915) was a Polish chemist, mathematician, and physicist. Together with Zygmunt Wróblewski, in 1883 he was the first scientist in the world to liquify oxygen and nitrogen.
Olszewski defended his doctoral dissertation at Heidelberg University, then returned to Kraków, where he was made profesor nadzwyczajny (associate professor).
In 1883, Zygmunt Wróblewski and Karol Olszewski were the first in the world to Liquefaction oxygen, nitrogen and carbon dioxide from the atmosphere in a stable state (not, as had been the case up to then, in a dynamic state in the transitional form as vapor).
In 1884, in his Kraków laboratory, Olszewski was the first to liquefy hydrogen in a dynamic state, achieving a record low temperature of −225 °C (48 K). In 1895 he liquefied argon. He then failed only to liquefy the newly discovered helium element."Olszewski, Karol Stanisław," Encyklopedia Polski, p. 464.
In January 1896, on hearing of Wilhelm Röntgen's work with , within a few days Olszewski replicated it. Later on, in early February he provided an X-ray image of a luxated elbow thus initiating the university's department of radiology.
He died on 24 March 1915 and was buried at the Rakowicki Cemetery in Kraków. In 2018, his ashes were transferred to one of Poland's National Pantheons located at the Church of Saints Peter and Paul in the Old Town district of Kraków.
According to physicist Andrzej Kajetan Wróblewski, Olszewski is among the greatest Polish physicists of the 20th century alongside Marie Curie, Marian Smoluchowski, Jerzy Pniewski, and Marian Danysz.
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