Which of the following characteristics is associated with a smoke explosion?

The characteristic associated with a smoke explosion is the presence of trapped gases in upper areas. In fire scenarios, as combustion occurs, smoke is produced which contains various flammable gases. When these gases accumulate in upper areas, such as ceilings or attics, they can create a highly combustible environment, particularly when mixed with air. If an ignition source is introduced to this area, it can lead to a rapid combustion event, often referred to as a smoke explosion.

The presence of trapped gases is crucial because it indicates a concentration of flammable materials that can ignite under the right conditions. This phenomenon highlights the importance of monitoring smoke and gas behavior in fire situations to prevent potential explosions.