What type of container is characterized by a ball-like appearance and support legs?

The container characterized by a ball-like appearance and support legs is known as a spherical tank. These tanks are designed to store gases or liquids under pressure and their shape allows for uniform distribution of stress on the container walls, which is essential for maintaining integrity under pressure. The spherical form minimizes the surface area for a given volume, making it efficient for storage and requiring fewer materials compared to other shapes.

Spherical tanks are commonly used in the chemical and oil industries for storing liquefied gases, such as propane, butane, and natural gas. The support legs are necessary to provide stability and secure the tank in an upright position, ensuring it can withstand external forces such as wind or seismic activity.

The other container types do not fit this specific description. Cylindrical tanks are elongated and have a circular cross-section, vertical tanks are typically tall and narrow rather than ball-like, and rectangular tanks have flat surfaces and right angles. Each of these designs serves different purposes in storage and transport but does not embody the unique characteristics of a spherical tank.