spontaneous combustion: meaning, definition, pronunciation and examples
C1Formal / Technical / Figurative
Quick answer
What does “spontaneous combustion” mean?
The ignition of organic material (like hay, oily rags, or coal dust) caused by internal chemical heat generation, without an external flame.
Audio
Pronunciation
Definition
Meaning and Definition
The ignition of organic material (like hay, oily rags, or coal dust) caused by internal chemical heat generation, without an external flame.
A sudden, intense, and often uncontrollable outbreak or emergence of something, typically used metaphorically.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or grammatical differences. Both use the same term identically.
Connotations
Identical in both. The literal meaning carries technical/scientific connotations; the figurative meaning suggests unpredictability and powerful internal forces.
Frequency
Frequency is comparable in both varieties, slightly higher in technical writing (engineering, chemistry) and literary/figurative use.
Grammar
How to Use “spontaneous combustion” in a Sentence
[Subject] undergoes spontaneous combustion.Spontaneous combustion of [material] occurred.This led to a spontaneous combustion of [abstract noun, e.g., creativity].Vocabulary
Collocations
Examples
Examples of “spontaneous combustion” in a Sentence
verb
British English
- The waste pile spontaneously combusted.
- Experts warned the material could spontaneously combust.
American English
- The compost heap spontaneously combusted.
- Oil-soaked rags are known to spontaneously combust.
adverb
British English
- The fire started spontaneously, through combustion.
adjective
British English
- The spontaneous combustion risk is high.
- They studied spontaneous combustion phenomena.
American English
- The spontaneous combustion hazard is serious.
- He wrote a paper on spontaneous combustion incidents.
Usage
Meaning in Context
Business
Rarely used literally. Figuratively: 'The market experienced a spontaneous combustion of volatility after the announcement.'
Academic
Used in chemistry, physics, engineering, and fire safety literature for the literal phenomenon. In humanities, used metaphorically for social movements or artistic trends.
Everyday
Almost exclusively used metaphorically to describe sudden, intense emotional reactions or events: 'Their argument was a spontaneous combustion of built-up resentment.'
Technical
The precise scientific term for the ignition of a substance from its internally generated heat (e.g., in piles of compost, coal stockpiles, or oily rags).
Vocabulary
Synonyms of “spontaneous combustion”
Neutral
Weak
Vocabulary
Antonyms of “spontaneous combustion”
Watch out
Common Mistakes When Using “spontaneous combustion”
- Using it to mean any fire that starts quickly (it must be from INTERNAL chemical heat, not a spark).
- Incorrect plural: 'spontaneous combustions' is rare but acceptable for multiple instances.
FAQ
Frequently Asked Questions
Yes, it is a well-documented chemical process where a material generates sufficient heat through internal oxidation (a slow reaction with air) to ignite itself without an external flame.
The alleged phenomenon of 'Spontaneous Human Combustion' (SHC) is not supported by mainstream science. Cases historically labelled as SHC are explainable by known external ignition sources and the 'wick effect,' where body fat acts as a fuel source once ignited.
The most common causes involve improperly stored materials with high oil content (like linseed oil on rags), moist organic piles (hay, compost, coal), or certain chemical powders that oxidize readily.
It is used to describe a situation where a sudden, powerful, and often disruptive event—like a riot, an artistic movement, or an emotional crisis—erupts seemingly without a single external trigger, but from accumulated internal pressure or energy.
The ignition of organic material (like hay, oily rags, or coal dust) caused by internal chemical heat generation, without an external flame.
Spontaneous combustion is usually formal / technical / figurative in register.
Spontaneous combustion: in British English it is pronounced /spɒnˌteɪ.ni.əs kəmˈbʌs.tʃən/, and in American English it is pronounced /spɑːnˌteɪ.ni.əs kəmˈbʌs.tʃən/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “It was a spontaneous combustion of ideas.”
- “The crowd's anger reached a point of spontaneous combustion.”
Learning
Memory Aids
Mnemonic
Think of a pile of old, oily rags in a garage heating up BY THEMSELVES (spontaneously) until they BURST INTO FLAMES (combustion) with no match.
Conceptual Metaphor
EMOTION/IDEAS ARE HEAT/FIRE (Intense feelings or ideas are internal heat that can suddenly ignite into visible action or expression).
Practice
Quiz
In a figurative sense, 'spontaneous combustion' most likely describes: