What characterizes an exothermic reaction?

An exothermic reaction is characterized by the release of heat into the surroundings, which is a key aspect of processes such as combustion. During an exothermic reaction, the total energy of the products is lower than that of the reactants, leading to the release of energy, often in the form of heat. This release of heat not only raises the temperature of the immediate environment but also can sustain and propagate the combustion process itself, which is crucial in fire dynamics.

In the context of fire investigation and combustion, understanding the nature of exothermic reactions is essential because it affects how fires start, spread, and can potentially be controlled. This characteristic of generating heat and driving the combustion process is why exothermic reactions are fundamental in fire behavior and investigation.