The word circulation can mean the following:

• The transport of blood through the circulatory system.
• Movement of gas or fluid through a physical circuit, such as air through a ventilated building. See also Atmospheric circulation.
• An imaginary circuit, such as money through the economy.
• The movement of people and goods within a system of interconnected roads.
• The number of people who buy or read a newspaper, periodical or other regular publication over a certain period of time.
• In fluid dynamics, circulation is the line integral of fluid velocity around a closed curve.
• In Graph theory, the circulation problem is a generalisation of network flow problems.

Circulation is also the name of a scientific journal published by the American Heart Association. A circulatory system (sometimes cardiovascular system) is an organ system that moves substances to and from cells; it can also help stabilize body temperature and pH (part of homeostasis). ... Antonym of psychical. ... Ventilation good and very bad Ventilation is air circulation of air, typically between a room, a tunnel, etc. ... Atmospheric circulation is the large-scale movement of air, and the means (together with the ocean circulation, which is smaller [1]) by which heat is distributed on the surface of the Earth. ... An example of Money. ... A street in Ynysybwl, Wales, typical of a small town A street is a public parcel of land adjoining buildings in an urban context, on which people may freely assemble, interact, and move about. ... This article is about the magazine as a published medium. ... Fluid dynamics is the subdiscipline of fluid mechanics that studies fluids (liquids and gases) in motion. ... In fluid dynamics, circulation is the path integral around a closed curve of the fluid velocity. ... This article is about path integrals in the general mathematical sense, and not the path integral formulation of physics which was studied by Richard Feynman. ... A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ... This article is about velocity in physics. ... A graph diagram of a graph with 6 vertices and 7 edges. ... In graph theory, a network flow is an assignment of flow to the edges of a directed graph (called a flow network in this case) where each edge has a capacity, such that the amount of flow along an egde does not exceed its capacity. ... Circulation is a scientific journal published by the American Heart Association. ... Proceedings of the National Academy of Sciences. ... The American Heart Association is a nonprofit organization in the United States that fosters proper cardiac care in the effort to reduce deaths caused by cardiac arrest. ...