Deflagration is subsonic combustion propagating through heat transfer: hot burning material heats the next layer of cold material and ignites it. Most "fires" found in daily life, from flames to explosions such as from black powder, are deflagrations.

What is meant by the term deflagration?

Deflagrations are rapidly burning fires in which the combustion zone propagates at a velocity that is slower than the speed of sound.

What is difference between detonation and deflagration?

Deflagrations and detonations

A deflagration occurs when a flame front propagates by transferring heat and mass to the unburned air–vapor mixture ahead of the front. ... A detonation occurs when the flame velocity reaches supersonic speeds above 600 m/s and generally in the 2000–2500 m/s range.