What condition describes smoke that is turbulent, hot, and dark during flashover?

The condition that describes smoke as turbulent, hot, and dark during flashover is referred to as heavy smoke. During a flashover, the intense heat in the room causes the gases and combustion products to rise rapidly and become turbulent, resulting in a thick and dark appearance. This heavy smoke is indicative of a high concentration of particulate matter and unburned fuel, signaling an imminent danger.

Understanding this characteristic is crucial for firefighters, as heavy smoke serves as a warning sign of potential flashover conditions. Recognizing these signs can help in making strategic decisions about ventilation, attack strategies, and safely navigating the environment during firefighting operations.