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Oxygen serves a crucial role in aviation, particularly at higher altitudes where the air pressure is lower, making it essential for pilot and passenger safety. However, one of the significant hazards associated with oxygen in aviation is that it acts as an oxidizer and increases flammability. This means that when oxygen is present in higher concentrations, it can significantly enhance the combustion process of flammable materials.

In environments with increased oxygen levels, even small sparks can ignite materials that would not normally catch fire in atmospheric conditions. This characteristic is particularly critical to consider when managing onboard systems, materials, and equipment, especially during emergencies where oxygen systems are utilized.

The concept of oxygen as an oxidizer supports the need for stringent safety protocols when handling oxygen systems and the materials in proximity to these systems in aviation contexts. Understanding this property is vital for ensuring the safety of flight operations and preventing fire hazards that could arise from the presence of oxygen.