There are many types of explosions caused by chemical reactions, and their manifestations depend mainly on the reaction rate, the concentration of released energy, and the environmental conditions when the reaction occurs. The following are some common types of explosions, but please note that any experiment involving high-energy reactions must be conducted by professionals under strictly controlled conditions, and these phenomena must never be attempted or studied without safety measures: 1. Detonation: • Characteristics: The energy released by the reaction is extremely concentrated, and the reaction wave is transmitted at supersonic speed, producing a sharp and strong shock wave. • Example: The explosion of explosives (such as TNT) under ideal conditions is a detonation. • Impact: Because the shock wave propagates very quickly, the impact force generated is extremely large, which has serious destructive power on structures and organisms. 2. Deflagration: • Characteristics: The combustion or reaction spreads outward at a subsonic speed. Although a large amount of energy is also released, it does not form a compression shock wave like a detonation. • Example: The combustion explosion that occurs when natural gas or gasoline is mixed with air under ignition conditions often belongs to the deflagration type. • Impact: In a closed space, deflagration may cause serious damage due to pressure accumulation, but its destructive mechanism mainly relies on pressure rise rather than instantaneous impact. 3. Steam cloud explosion or gas explosion: • Characteristics: Certain chemical reactions generate a large amount of flammable gas or steam, which forms an explosive mixture with the surrounding air and may explode once it encounters a fire source. • Example: Combustible gas leaked in an industrial accident may cause a steam cloud explosion when it encounters a spark in a closed or semi-closed space. • Impact: This type of explosion is generally accompanied by violent combustion and pressure waves, which can easily lead to fire spread and structural damage. 4. Dust explosion: • Characteristics: Fine solid particles (such as metal, grain dust or sawdust) suspended in the air may explode when they encounter an ignition source if they reach a certain concentration. • Example: Explosion accidents caused by excessive dust concentration in places such as granaries, woodworking factories or chemical plants. • Impact: Although the heat release of a single particle is limited, the overall explosion energy can still form a fatal shock wave and flame propagation after concentration. In summary, the types of explosions that may occur after "certain chemicals combine" mainly include fixed explosion and deflagration, in addition to explosions caused by the generation of flammable gas or dust. The actual type of explosion that occurs is closely related to factors such as the mechanism of the chemical reaction, the physical state of the substance, the mixing ratio, the ambient temperature, pressure, and whether it is in a closed environment. Once again, it is emphasized that the study of explosion reactions must be based on strict safety protection and scientific experimental conditions. This information is only used for academic explanations of chemical reaction mechanisms. Any person who does not have relevant qualifications and safety guarantees cannot attempt to conduct related experiments.