Movement
Usually, as a plume moves away from its source, it widens because of entrainment of the surrounding fluid at its edges. Plume shapes can be influenced by flow in the ambient fluid (for example, if local wind blowing in the same direction as the plume results in a co-flowing jet). This usually causes a plume which has initially been 'buoyancy-dominated' to become 'momentum-dominated' (this transition is usually predicted by a dimensionless number called the Richardson number).
Read more about this topic: Plume (hydrodynamics)
Famous quotes containing the word movement:
“... contemporary black women felt they were asked to choose between a black movement that primarily served the interests of black male patriarchs and a women’s movement which primarily served the interests of racist white women.”
—bell hooks (b. c. 1955)
“Our movement took a grip on cowardly Marxism and from it extracted the meaning of socialism. It also took from the cowardly middle-class parties their nationalism. Throwing both into the cauldron of our way of life there emerged, as clear as a crystal, the synthesis—German National Socialism.”
—Hermann Goering (1893–1946)
“She had to lean away.
She dared not stir a foot,
Lest movement should provoke
The demon of pursuit
That slumbers in a brute.”
—Robert Frost (1874–1963)