Explosion is defined as which of the following?

• A. The sudden and rapid escape of gases from a confined space, with high temperatures, violent shock, and loud noise.
• B. A slow leakage of gas with little heat.
• C. A fire without explosion hazard.
• D. A chemical reaction that cools the environment.

Answer: (A)

Explosion is a rapid and forceful release of energy that happens when gases are confined and suddenly expand, producing high temperatures, a violent shock wave, and a loud noise. The confinement allows pressure to build quickly, so the energy release creates a blast effect rather than a slow leak or a simple flame. A slow gas leakage with little heat wouldn’t generate the same sudden overpressure or shock. A fire without explosion hazard may burn, but it won’t produce a blasting wave. A cooling chemical reaction is not about rapid energy release and blast effects either.