Which of the following is a major risk of improperly stored oxygen tanks?

Improperly stored oxygen tanks present a significant risk of explosion or fire hazard due to the highly flammable nature of oxygen when it is under pressure. Oxygen itself is not a combustible substance, but it supports and accelerates combustion. If tanks are stored inappropriately—such as in an area with flammable materials, high heat, or physical damage—it increases the chance of a fire starting.

High-pressure oxygen tanks can also burst if subjected to extreme temperatures, resulting in an explosive release of gas. Moreover, if a tank is knocked over or damaged, it can cause the oxygen to escape rapidly, which can lead to further fire hazards in environments where flammable materials are present. Ensuring proper storage conditions, such as using secure, ventilated spaces away from heat sources and flammable substances, is critical to preventing these kinds of dangerous incidents.