Explosion
Definition and meaning of Explosion in chemistry.
An explosion is a sudden, violent release of energy that produces a rapidly expanding volume of hot gas, generating a pressure wave capable of doing mechanical damage.
In more detail
Chemical explosions occur when a highly exothermic reaction converts solid or liquid reactants into a large volume of hot gas within milliseconds or less. What makes an explosion destructive is the rate of energy release rather than the total energy alone: the same energy released slowly, as in ordinary burning, produces no shock wave. Explosives such as TNT or nitroglycerin carry both fuel and oxidizer within a single molecule, letting the decomposition proceed far faster than combustion in air. Explosions are classified as deflagrations, which propagate subsonically through heat conduction, or detonations, which propagate as a supersonic shock wave that compresses and ignites material ahead of it.
Key facts
| Field | Physical Chemistry |
|---|---|
| Mechanism | Rapid exothermic decomposition or combustion producing expanding gas |
| Detonation velocity | Roughly 1,500-9,000 m/s (supersonic) |
| Common explosive | TNT, C7H5N3O6 |
Detonation of TNT (trinitrotoluene, C7H5N3O6) decomposes the solid explosively according to 2 C7H5N3O6 → 3 N2 + 5 H2 + 12 CO + 2 C, releasing energy and generating a supersonic shock wave within microseconds.
Frequently asked questions
What is the difference between deflagration and detonation?
Deflagration is subsonic combustion that spreads by heat transfer through the material, while detonation is a supersonic shock wave that compresses and ignites material ahead of it almost instantly.
Is every explosion caused by a chemical reaction?
No. Physical explosions, such as a boiler or pressurized gas cylinder bursting, release stored mechanical or thermal energy without any chemical reaction taking place.