Circulation

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Circulation may refer to:

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• Atmospheric circulation, the large-scale movement of air

• Circulation (physics), the path integral of the fluid velocity around a closed curve in a fluid flow field

• Circulatory system, a biological organ system whose primary function is to move substances to and from cells

• Circulation problem, a generalization of network flow problems

• Exhaust gas recirculation, a nitrogen oxide reduction technique used in most gasoline and diesel engines

• Ocean circulation, the large-scale movement of water

• Circulation (film), a 2008 psychological thriller-fantasy film by Ryan Harper

• Circulation (journal), a journal published by the American Heart Association

• Print circulation, the average number of copies of a periodical publication

• Library circulation, the activities around the lending of library books and other material to users of a lending library

• Circulation (architecture), the flow of people through a building

• Circulation (currency), all currency held by consumers and businesses, but not by financial institutions and governments

• Rhetorical circulation, the ways that texts and discourses move through time and space

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