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an acronym that referrs to the Transition from Deflagration to Detonation of an energetic material.

A simple definition of deflagration is "slow" combustion. Although on our timescale deflagrations often appear to be very fast, when compared to a detonation, they move along at a snailŐs pace. Common gunpowder, for example if ignited in an open container without confinement will burn vigorously, and realease hot gasses, but will not explode. If ignited in a heavily confined container, such as the chamber of a gun, the release of hot gasses causes the pressure to rise very quickly and the bullet is forced out of the barrel at a high velocity. As mentioned, this type of combustion, although fast for us, is relatively slow when compared to a detonation.