What is the term for triangular-shaped pattern of a hazmat release with a point source at the breach and a wide base downrange?

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A cone is the pattern you get when a hazmat release comes from a single breach and jets outward, widening as it moves downwind. The breach is the point source, and as the material exits it entrains surrounding air and spreads due to wind and turbulence, creating a triangular, cone-shaped plume with a narrow tip at the source and a broad base downwind. The angle of that cone depends on how fast and how much material is released, the material’s properties, and the wind conditions. This shape helps responders estimate the downwind hazard zone and plan protective actions. In contrast, a stream stays relatively narrow and directed, a pool spreads across a surface in a more irregular area, and a sheet forms a thin, wide layer. So the triangular, widening-downwind pattern is characteristic of a cone.