Construct · 3 fields · 3 citations

jet: one construct, many systems

One name. One construct. Different systems. One map.

● invariant · one construct, three systems Nearest construct by meaning·not indexed
the same collimated flow, high in the airthe same collimated flow, at cosmic scalejet3 SYSTEMSFluid jetRAYLEIGH · 1878Jet streamROSSBY · JET STREAMAstrophysical jetBLANDFORD & REES · 1974

Spokes are the systems the one construct recurs in; dashed arcs are shared lineage. Tap a field for its definition, unit, and measures.

1878Fluid jet1947Jet stream1974Astrophysical jet
2026

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Fluid dynamics

A narrow fast stream shooting into still fluid

In fluid dynamics a jet is a narrow, fast stream of fluid issuing into a surrounding body of the same or another fluid, carrying momentum forward while entraining and mixing the ambient fluid along its edges, and often breaking up once it becomes unstable. Rayleigh's 1878 On the instability of jets analysed mathematically why a smooth stream of fluid develops growing disturbances and fragments. The referent is a collimated momentum-driven flow characterised by its centreline speed, width, and spreading rate, the same construct that, scaled up, becomes a current of air or a beam of cosmic plasma.[1]

Unit
The centreline velocity and width of a collimated flow, and its spreading rate
Recovery means
Not applicable
Measured by
Characterised by centreline velocity decay, the jet half-width and spreading angle, and the onset of instability and breakup

Atmospheric science

A fast river of wind steering the weather

In the atmosphere the same construct appears as the jet stream: a fast, narrow, meandering current of air near the tropopause, embedded in the broader flow and maintained by large-scale temperature and momentum gradients, that steers and energises midlatitude weather systems. Rossby's 1947 On the distribution of angular velocity in gaseous envelopes under the influence of large-scale horizontal mixing processes set out the dynamics concentrating westerly momentum into such a current. It is the identical collimated fast-flow idea as a laboratory jet, realised as a planetary wind and measured by its core wind speed, width, and position rather than by a nozzle flow.[2]

Unit
The core wind speed, width, and height of the fast air current
Recovery means
Not applicable
Measured by
Tracked by the core (maximum) wind speed, the latitude and height of the jet axis, and the width of the fast-flow band

Astrophysics

A beam of plasma fired from a compact object

In astrophysics a jet is a highly collimated, often relativistic outflow of plasma launched from the vicinity of an accreting compact object such as a supermassive black hole, extending far beyond its host galaxy and feeding the lobes of radio sources. Blandford and Rees's 1974 A 'twin-exhaust' model for double radio sources proposed how a confined channel collimates such a flow into opposing beams. It is the same collimated momentum-carrying flow as a water jet or the jet stream, here made of magnetised plasma at cosmic scale and measured by its emission morphology and speed rather than by a flow meter.[3]

Unit
The speed, collimation, and length of the plasma outflow
Recovery means
Not applicable
Measured by
Inferred from synchrotron-emission morphology, the opening (collimation) angle, apparent (superluminal) speeds, and jet length

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Nearby constructs

beam1 fields · 2 citationsanchor · a standalone constructbody2 fields · 3 citationsjingle · one word, two constructschannel4 fields · 4 citationsjingle · one word, four constructs

References

  1. Rayleigh, Lord. (1878). On the instability of jets. Proceedings of the London Mathematical Society, s1-10(1), 4–13. https://doi.org/10.1112/plms/s1-10.1.4
  2. Rossby, C.-G. (1947). On the distribution of angular velocity in gaseous envelopes under the influence of large-scale horizontal mixing processes. Bulletin of the American Meteorological Society, 28(2), 53–68. https://doi.org/10.1175/1520-0477-28.2.53
  3. Blandford, R. D., & Rees, M. J. (1974). A 'twin-exhaust' model for double radio sources. Monthly Notices of the Royal Astronomical Society, 169(3), 395–415. https://doi.org/10.1093/mnras/169.3.395

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