During which fire phase do hot gases rise and the flame increases in size?

The growth phase of a fire is characterized by the rapid increase in temperature and the expansion of combustion materials, which leads to an increase in the size of flames. During this phase, hot gases generated by the fire naturally rise due to their lower density compared to cooler air. This rising phenomenon can create convective currents that help spread the heat and flame to other nearby combustible materials, potentially leading to flashover if the conditions are right. The growth phase is critical, as it is when the fire begins to intensify and can become more dangerous; understanding this phase is essential for firefighters as it underscores the importance of quick response and proper ventilation techniques to manage the fire effectively before it reaches the fully developed stage. This phase lays the groundwork for the subsequent behaviors of fire, making it crucial for firefighters to recognize and act upon it effectively.