German chemist (1877–1964)
Leo Ubbelohde (4 January 1877, Hanover – 28 February 1964, Düsseldorf) was a German chemist.
During his career he served as a professor in Karlsruhe and Berlin. He is known for his research on mineral oils, fuels, catalysis and viscosity.
He was the inventor of a suspended-level viscometer used for determining kinetic viscosity, known today as a "Ubbelohde viscometer". 
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