What occurs during the process of thermal layering?

During the process of thermal layering, gases in a fire environment do not mix uniformly; instead, they stratify based on differences in temperature and density. Warmer gases are less dense and tend to rise, while cooler gases, which are denser, settle lower in the atmosphere. This results in a layering effect, where you can have distinct layers of hot, smoky gases above cooler, less smoke-laden air. This phenomenon is critical for understanding fire dynamics and smoke movement within a structure, as it affects visibility, heat retention, and the potential for backdrafts. Understanding thermal layering is essential for firefighters, as it can influence tactics and safety during operations.