Which dispersion pattern is circular and seen when air movement is minimal?

Which dispersion pattern is circular and seen when air movement is minimal?

• A. Cloud dispersion pattern
• B. Spherical dispersion
• C. Plume dispersion
• D. Stream dispersion

Answer: (A)

When air movement is minimal, the released material expands outward evenly in all directions from the source, forming a circular mass around the point of release. This round, outward spread is described as cloud dispersion, because you can visualize a visible cloud forming around the source in still air. As wind increases, the pattern would shift into a plume that stretches in the wind’s direction, rather than staying circular. A spherical or 3D ball of dispersion isn’t the typical field description for a still-air release in this context, and stream dispersion isn’t a standard term used here.

When air movement is minimal, the released material expands outward evenly in all directions from the source, forming a circular mass around the point of release. This round, outward spread is described as cloud dispersion, because you can visualize a visible cloud forming around the source in still air. As wind increases, the pattern would shift into a plume that stretches in the wind’s direction, rather than staying circular. A spherical or 3D ball of dispersion isn’t the typical field description for a still-air release in this context, and stream dispersion isn’t a standard term used here.