Which of the following is a container release type?

• A. Cloud
• B. Hemispheric
• C. Plume
• D. Cone

Answer: (C)

Plume is the pattern that describes a continuous, wind-driven release from a container. When material leaks or vents over time, it tends to form a narrow, elongated plume that travels downwind, spreading and diluting as it goes. This reflects how responders model and predict downwind hazard during a sustained release, helping establish the area to monitor and protect. In contrast, a hemispheric release is an instantaneous release that expands in all directions from the source, a cone describes a jet-like discharge forming a conical shape, and a cloud is a more general, non-directional spread. So the plume type best fits the typical behavior of a container release.