What are the five factors needed for an explosion to occur?

The correct set of five factors that are essential for an explosion to occur are Heat, Fuel, Oxygen, Suspension, and Confinement.

In an explosive reaction, heat is necessary to initiate the combustion process, while fuel serves as the reactive material that combusts. Oxygen acts as the oxidizing agent, facilitating the reaction. The term 'suspension' refers to the necessary condition that the fuel must be dispersed in a way that allows mixing with air or oxygen, typically in a gaseous or aerosol state. Finally, confinement creates the necessary pressure build-up for an explosion to occur, as it allows explosive forces to accumulate and then rapidly expand.

These factors collectively explain how an explosion can take place, which often includes the presence of a mixture of gases or particles that can ignite and release energy quickly. Understanding these elements is crucial for safety in environments where flammable materials are present.