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In fluid mechanics: Bernoulli’s law
In steady flow, the fluid is in motion but the streamlines are fixed. Where the streamlines crowd together, the fluid velocity is relatively high; where they open out, the fluid becomes relatively stagnant.
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convergence and divergence

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Figure 7: Vertical cross sections through a wave system depicting typical divergence/convergence distributions for non-tilting and tilting systems.

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convergence and divergence

atmospheric

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Related Topics:: fluid flow; orographic lifting

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convergence and divergence, in meteorology, the accumulation or drawing apart of air, as well as the rate at which each takes place. The terms are usually used to refer specifically to the horizontal inflow (convergence) or outflow (divergence) of air. The convergence of horizontal winds causes air to rise, whereas the divergence of horizontal winds causes downward motion of the air (subsidence). Ground-level atmospheric pressure is not affected by convergence if divergence of an equal magnitude occurs simultaneously at higher levels.

This article was most recently revised and updated by John P. Rafferty.