What does deflagrable mean?
Deflagrable is an adjective meaning capable of rapid combustion, especially combustion that propagates quickly through a material with the release of heat and light. It is especially common in chemistry, industrial safety, and discussions of combustible dust, where engineers describe a substance or dust cloud as deflagrable when it can produce a deflagration. The term is more precise than simply saying that something is combustible or flammable: its defining feature is speed, and the rapid release of gases and energy may contribute to an explosion, although deflagrability does not mean an explosion will necessarily occur. Deflagrable materials include some powders, finely divided solids, and other reactive substances, but the word does not identify a particular chemical composition. In ordinary prose, “deflagrable” is usually a technical label used in safety guidance, standards, and risk assessments. Its usefulness lies in distinguishing a material that merely burns from one capable of a sudden, fast-burning event, a distinction central to preventing fires and dust explosions.
adjectiveAble to burn rapidly; liable to deflagration. The term usually denotes a material capable of combustion that propagates quickly, with the release of heat and light.
- Capable of rapid combustion or deflagration, especially with a sudden release of heat and light.
"The safety manual identifies the finely divided powder as highly deflagrable and therefore subject to special handling procedures."
"Only highly deflagrable powders were permitted in the production area."
"The material's safety sheet states that the dried substance is readily deflagrable."
Deflagrable is chemistry's warning label for a material that can turn a spark into a rapid flash.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does deflagrable come from?
Deflagrable is based on Latin dēflagrāre, meaning “to burn rapidly,” with the English suffix -able. The Latin root flagrāre means “to blaze” or “to burn,” and is preserved in related words such as flagrant and flagration. English also developed deflagrate and deflagration from the same Latin-based family.
Related word forms
How deflagrable is actually used
This is chiefly a technical and formal term used in chemistry, industrial safety, pyrotechnics, and assessments of fire and dust-explosion hazards. It is more specific than simply saying that a material is combustible, because rapid propagation is central to its meaning. Deflagrability does not by itself mean that an explosion will occur.
Easily confused with deflagrable
Deflagrable is an adjective describing something capable of rapid burning, whereas deflagrate is a verb meaning to burn rapidly.