An atmosphere containing more than 23.5% oxygen by volume is referred to as what?

An atmosphere containing more than 23.5% oxygen by volume is referred to as an oxygen-enriched atmosphere. This designation is important in safety protocols, particularly in confined spaces, because such an environment can significantly increase the risk of fire and explosion. Normal atmospheric air contains approximately 20.9% oxygen, and when the concentration exceeds 23.5%, it poses hazards beyond those present in standard air.

Understanding the implications of an oxygen-enriched atmosphere is crucial for rescue technicians, as this condition can affect both the behavior of materials within the space and the safety of personnel entering the area. Firefighters and rescue professionals must adhere to strict safety guidelines when working in environments with elevated oxygen levels to mitigate potential risks.