What is the best description of a smoldering fire?

A smoldering fire is characterized by burning quietly without flames, which is an important aspect of how it behaves. This type of fire typically involves the combustion of materials at lower temperatures and relies on the availability of oxygen. In smoldering combustion, materials, such as wood or charcoal, can burn slowly, producing heat without the typical visible flames associated with a fully developed fire.

This behavior is significant because, although it may appear to be less hazardous than flaming fires, smoldering fires can produce a significant amount of smoke and toxic gases that may pose risks to health and safety. While it is true that such fires may create a constant rate of combustion, it is not primarily defined by that characteristic. Additionally, smoldering fires are not inherently controllable, as they can still spread and develop into more dangerous situations under certain conditions. Thus, the defining feature of smoldering fires is their ability to burn quietly without flames.