What materials may be used to enhance the thermal effects of explosives?

Using powdered aluminum or magnesium to enhance the thermal effects of explosives is grounded in their ability to produce additional heat when detonated. These materials serve as fuels that can increase the overall energy release during an explosion. When incorporated into an explosive composition, the aluminum combustion increases the temperature and pressure generated by the blast, leading to a more powerful effect. This phenomenon is particularly valuable in military applications and demolition practices, where maximizing explosive effectiveness is critical.

In contrast, other options such as water or foam agents are primarily used for suppression or extinguishing of flames rather than enhancing explosive reactions. Sand or earth materials can provide stability or containment but do not contribute to the increase of thermal energy during an explosion. Organic compounds might offer some reactions in certain contexts, but not all serve to enhance thermal effects specifically in the way that powdered aluminum or magnesium does. Therefore, the use of these specific powdered metals stands out for their role in amplifying the explosive's thermal performance.