What does a decrease in the temperature of a smoke layer typically indicate?

A decrease in the temperature of a smoke layer typically indicates that water application is effective. When firefighters use water on a fire, it absorbs heat and cools down the smoke and the surrounding atmosphere. A drop in temperature is often a direct result of the successful application of water, which can help to suppress the fire and improve visibility for the firefighters within the environment.

This cooling effect not only helps in extinguishing the flames but can also lead to a reduction in toxic gases present in the smoke, making the environment safer for both firefighters and any potential victims. Therefore, when observing a decrease in the temperature of the smoke layer, it serves as a clear indicator of the effectiveness of firefighting efforts in managing the fire situation.