Which of the following is NOT a dispersion pattern for cryogenic containers?

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

Answer: (D)

When a cryogenic release disperses, the vapor spreads in patterns shaped by buoyancy and wind. The common patterns you’ll see are hemispheric expansion when there’s little wind and the release expands evenly in all directions, a plume when wind carries the vapor downwind creating a elongated, tapered shape, and a cloud when the cold vapor condenses moisture in the air to form visible fog around the release. Cone is not observed as a dispersion pattern for cryogenic releases because a cone implies a focused, directed jet from a nozzle, which doesn’t describe how cryogenic vapors behave in open air. They don’t maintain a stable conical jet; instead they rapidly buoyantly rise, spread, and mix with the atmosphere, producing hemispheric, plume, or cloud shapes instead.