Deflagration
A detonation generates greater pressures and is more destructive than a deflagration.
A deflagration is a fire in which a flame travels rapidly, but at subsonic speed, through a gas.
Deflagration is an explosion in which the speed of burning is lower than the speed of sound in the surroundings.
A deflagration is an explosion where the flame speed is lower than the speed of sound, which is approximately equal to 335 m/sec (750 mph).
Explosives that deflagrate are known as low explosives. The actual speed of the explosion can vary from 1–350 m/s (2–780 mph). Peak pressures produced by low explosives are orders of magnitude lower than those produced by high explosives, and the damage inflicted by low explosives can vary greatly depending on the fuel and confinement. For example, if black powder is ignited outside of containment, it just fizzles, but when it is confined, it creates an explosion that can propel bullets.
In addition to the black powder example, examples of deflagrations involving low explosives include the ignition of propane gas for a cooking grill and fuel powering of a combustion engine in a car
Deflagrate combines the Latin verb flagrare, meaning "to burn," with the Latin prefix de-, meaning "down" or "away." Flagrare is also an ancestor of such words as conflagration and flagrant and is distantly related to fulgent and flame. In the field of explosives, deflagrate is used to describe the burning of fuel accelerated by the expansion of gasses under the pressure of containment, which causes the containing vessel to break apart. In comparison, the term detonate (from the Latin tonare, meaning "to thunder") refers to an instant, violent explosion that results when shock waves pass through molecules and displace them at supersonic speed. Deflagrate has been making sparks in English since about 1727, and detonate burst onto the scene at around the same time.
Collins. Retrieved from: https://www.collinsdictionary.com/dictionary/english/deflagration
.Brian O'Connor( 2023, березень 27).Explosions, Deflagrations, and Detonations. Retrieved from: https://www.nfpa.org/news-blogs-and-articles/blogs/2023/03/27/explosions-vs-deflagrations-vs-detonations
Merriam-webster. Retrieved from https://www.merriam-webster.com/dictionary/deflagrate