Raschig ring

noun
Ra·schig ring | \ ˈräshə̇g- \

Definition of Raschig ring 

: a small hollow cylinder having a length about equal to the diameter, made usually of metal, carbon, or ceramic material, and used as packing material for chemical towers

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History and Etymology for Raschig ring

after Friedrich Raschig †1928 German chemist, its inventor

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