Which terminology refers to the tendency of gases to form into layers according to temperature?

• A. Type of fuel
• B. Thermal layering
• C. Location of ignition
• D. Location of fuel package

Answer: (B)

Thermal layering describes how gases separate into horizontal layers based on temperature because density changes with temperature. Hot gases are lighter, so they rise and collect near the ceiling, while cooler, denser gases stay closer to the floor. This creates distinct temperature-based layers, which is exactly what the term thermal layering captures. The other options don’t fit because they relate to fuel type, where ignition occurs, or where the fuel is placed, none of which describe how gas temperature causes vertical stratification.