What is a "flashback" in relation to explosive substances?

A "flashback" refers to the backward movement of flames to their source of ignition. This phenomenon occurs when flames or a combustion reaction travels back through a fuel source or a pathway, such as gas lines or vapors, which can happen if there is an inadequate ventilation or a sudden influx of oxygen. Flashbacks can be particularly dangerous as they can lead to the ignition of flammable materials at their source, potentially causing further explosions or fires.

Understanding the nature of flashbacks is critical for safety in the handling of explosive substances, as this behavior can lead to unexpected ignition scenarios that compound the risks associated with explosions. This makes it important to maintain proper safety protocols and engineering controls when working near explosive materials.