Firefighters need to truly understand fire phenomena in order to select the proper tactics and anticipate dangerous conditions. To do so, they must first have a basic understanding of the physics of fire behavior. This is another video by Battalion Chief Ågerstrand in Sweden that further explains some of the basics of fire behavior and the concepts of a thermal ballast, flammability limits, and backdrafts. The video introduces some great fire science visualization tools that can be used to help understand fire behavior.
ypical modern structural fires encountered by firefighters are generally ventilation limited. As oxygen in the structure is depleted, the flames and temperatures decrease. After the initial drop in oxygen, oxygen levels begin to increase, but there is no corresponding increase in temperature or flames. Why is this?