What is an important characteristic of gaseous fuels in fire behavior?

Gaseous fuels commonly possess a high propensity to rise due to their lower density compared to air. As these gases heat up, they expand and become less dense, which prompts them to ascend. This characteristic is significant in fire behavior because it determines how gases are dispersed in an environment and can influence the movement of smoke and heat during a fire. Understanding that gaseous fuels tend to rise helps firefighters anticipate fire behavior, particularly when dealing with smoke plumes and the potential for flashover or other fire dynamics. This insight is crucial for effective fire suppression and safety measures.