What is the phenomenon where gases form layers according to their temperature?

The phenomenon where gases form layers according to their temperature is referred to as thermal layering. This occurs because warmer gases are less dense than cooler gases, causing them to rise and form distinct layers based on temperature. In a fire scenario, understanding thermal layering is critical for fire fighters as it impacts smoke movement, visibility, and the potential for flashover. Recognizing that temperatures can vary significantly within different layers of smoke and heat helps in making informed decisions about ventilation, entry, and rescue operations.

Other terms like fire stratification, heat diffusion, and combustion layering, while related to heat and gas behaviors in fire situations, do not correctly describe the specific layering of gases based solely on temperature differences.