What potential hazard can occur from improperly secured medical gas cylinders?

The potential hazard of improperly secured medical gas cylinders is that they may roll and cause injury. When cylinders are not properly secured, they can unexpectedly tip over or roll, leading to a situation where they can strike individuals nearby, which poses a significant risk of physical injury. Securing medical gas cylinders is essential for maintaining a safe environment in healthcare settings, as it prevents accidents that can be attributed to the cylinders moving unpredictably. Properly securing the cylinders ensures that they remain in place and reduces the risk of injury not only to staff but also to patients and visitors.

The other options highlight important safety concerns related to medical gas cylinders, but they do not directly address the immediate hazard of rolling or tipping. While leaks and contamination are crucial issues to consider in the management of medical gases, the act of ensuring that cylinders are securely fastened addresses the most direct danger associated with their placement and handling.