Partial pressures and oxygen toxicity can be used to explain why compressed air?

Compressed air is often used for diving, but as divers descend deeper underwater, the partial pressures of gases in the mixture change significantly. The deeper a diver goes, the higher the partial pressure of oxygen becomes. At depths greater than approximately 215 feet (65.5 meters), the partial pressure of oxygen can reach levels where oxygen toxicity may occur. This toxicity can manifest in various symptoms, including central nervous system effects like convulsions, visual disturbances, and other neurological impairments.

Understanding the critical threshold for safe diving with compressed air is essential in maintaining diver safety and preventing potentially life-threatening conditions. Thus, it is advised that divers avoid using compressed air at depths beyond this safety limit to mitigate the risk of oxygen toxicity, supporting the assertion found with the chosen answer.