Which term best describes an explosive event characterized by slowly moving blast pressure?

The term that best describes an explosive event characterized by slowly moving blast pressure is low order explosion. This type of explosion typically involves a slower reaction rate, resulting in less violent shock waves compared to a high order explosion. Low order explosives tend to produce a more gradual release of energy, which can manifest as a slowly moving blast wave rather than the instantaneous, rapid energy release seen in high order explosives.

Low order explosions can occur with materials like black powder or certain types of propellants, which produce a pressure wave that may travel more slowly and with less intensity. Understanding this distinction is crucial for fire and explosion investigation, as it significantly influences the analysis of an explosive incident and its effects on the surrounding environment.