Which type of Self-Contained Self-Rescuer (SCSR) involves a chemical reaction?

The type of Self-Contained Self-Rescuer (SCSR) that involves a chemical reaction is indeed the 100 model. This device utilizes a chemical process to generate breathable oxygen while absorbing carbon dioxide, allowing a miner to breathe safely in an atmosphere that may be toxic or low in breathable air. The chemical reaction typically involves a chemical oxygen generator that produces oxygen from chemicals such as sodium chlorate or potassium superoxide, thus providing essential respiration for a specified duration.

The use of chemical reactions in this model is crucial as it enables the device to provide a self-contained oxygen supply in emergencies, such as a mine accident, where conditions can change rapidly and require immediate access to breathable air. Understanding this mechanism is fundamental for safety training in mining environments.