What chemical process generates oxygen in closed-circuit SCBA equipment?

The chemical process that generates oxygen in closed-circuit Self-Contained Breathing Apparatus (SCBA) equipment is the reaction of moisture with potassium superoxide. In this process, potassium superoxide interacts with the moisture present in exhaled breath to produce oxygen and potassium hydroxide. This reaction is advantageous in a closed-circuit system because it allows for the reclamation of carbon dioxide and replenishment of oxygen, enhancing the overall efficiency of the breathing apparatus for extended use.

The other options do not apply to the functioning of closed-circuit SCBA systems. Electrolysis of water requires an external power source and is not a typical method used in these systems. Combustion of fuels consumes oxygen rather than generating it, and decomposition of chemical agents does not specifically pertain to the method of oxygen generation within SCBA equipment. Therefore, the reaction of moisture with potassium superoxide is the correct and most relevant process in the context of closed-circuit SCBA operations.