turbulence

n. non-smooth and irregular flow in fluids (Hydraulics); quality of being turbulent; irregular atmospheric motion (Meteorology)

In fluid dynamics, turbulence or turbulent flow is a flow regime characterized by chaotic, stochastic property changes. This includes low momentum diffusion, high momentum convection, and rapid variation of pressure and velocity in space and time. Flow that is not turbulent is called laminar flow. The (dimensionless) Reynolds number characterizes whether flow conditions lead to laminar or turbulent flow; e.g. for pipe flow, a Reynolds number above about 2300 will be turbulent.
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Noun
1. unstable flow of a liquid or gas
(synonym) turbulency
(hypernym) physical phenomenon
(hyponym) rip, riptide, tide rip, crosscurrent, countercurrent
2. instability in the atmosphere
(hypernym) bad weather, inclemency, inclementness
(hyponym) clear-air turbulence
3. a state of violent disturbance and disorder (as in politics or social conditions generally); "the industrial revolution was a period of great turbulence"
(synonym) upheaval, Sturm und Drang
(hypernym) disorder
(hyponym) agitation, ferment, fermentation, unrest
(classification) politics, political science, government

n. turbulence, noisiness, excitement

(n.)
The quality or state of being turbulent; a disturbed state; tumult; disorder; agitation.