Recirculation
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Recirculation".

Look up circulation in Wiktionary, the free dictionary.

Circulation may refer to:

• Circulatory system, a biological organ system whose primary function is to move substances to and from cells
• Circulation (fluid dynamics), the path integral of the fluid velocity around a closed curve
• Circulation (journal), one of the journals published by American Heart Association
• Exhaust gas recirculation, a nitrogen oxide reduction technique used in most gasoline and diesel engines
• Atmospheric circulation, the large-scale movement of air
• Newspaper circulation, the average number of copies of a newspaper distributed on a day
• Magazine circulation, the average number of copies of a periodical distributed per edition/ volume
• Circulation (UK duo), a UK house music duo
• Circulation problem, a generalisation of network flow problems
• Library circulation, the activities around the lending of library books and other material to users of a lending library
• Circulation (currency), the transfer of currency through the hands of civilians

See also

• List of circulating currencies

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