Circulation

Circulation may refer to:

Science and technology

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
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
Exhaust gas recirculation, a nitrogen oxide reduction technique used in most gasoline and diesel engines
Ocean circulation, the large-scale movement of water

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
Rhetorical circulation, the ways that texts and discourses move through time and space
Circulation Festival, an annual circus and fire performance festival held in Dunedin, New Zealand
Circulation (film), a 2008 psychological thriller-fantasy film by Ryan Harper
Circulation (journal), a journal published by the American Heart Association