Combustion can range in violence from deflagration through detonation. RDX undergoes a deflagration to detonation transition (DDT) in confinement and certain circumstances. Under certain conditions a deflagration to detonation transition can occur. Unintentional detonation when deflagration is desired is a problem in some devices. Of more interest are the other two rapid forms besides decomposition&colon; deflagration and detonation. Subsonic explosions are created by low explosives through a slower burning process known as deflagration. The deflagration may continue downstream of the arrester. A deflagration then occurs as the fine mist of oil ignites and burns extremely rapidly. This caused a deflagration (a burning vapour cloud). Spark-ignition engines are designed to burn gasoline in a controlled process called deflagration. When flame velocities are low, the effect of a deflagration is to release heat. Adding water to a burning hydrocarbon such as oil or wax produces a deflagration. In more massive stars, the fusion of neon proceeds without a runaway deflagration. Damage to buildings, equipment and people can result from a large-scale, short-duration deflagration. The risks of deflagration inside waste storage drums is a growing concern in storage facilities.