combustion

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/kəmˈbʌs.tʃən/
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The burning of a substance through a heat-releasing reaction, especially in fires and engines, with a rarer figurative use for violent social or emotional turmoil.
Practice using combustion in conversation until it feels natural

Examples

  • The lab measured the heat of combustion for several fuels.
  • Poor ventilation can make combustion incomplete and produce carbon monoxide.
  • Years of economic strain brought the region to combustion.
  • The empire entered a period of combustion after the succession crisis.
  • Complete combustion of methane produces carbon dioxide and water.

Similar words

oxidation
upheaval
ignition
flare-up
tumult
eruption
unrest
burning
combustion reaction
agitation

Meanings

Burning chemical reaction

noun
chemistry
neutral
A reaction in which a fuel or other substance burns with an oxidizer, usually producing heat and often light or flame.

Usage

Use combustion for the process of burning in science, engines, fires, and fuel use.

Examples

  • The combustion of gasoline releases heat that drives the engine.
  • Complete combustion of methane produces carbon dioxide and water.
  • Poor ventilation can make combustion incomplete and produce carbon monoxide.
  • The lab measured the heat of combustion for several fuels.
  • A spark can start combustion when fuel vapor mixes with air.
  • Internal combustion engines burn fuel inside the cylinder.

Common mistakes

The adjective combustible is used where the noun combustion is needed, or the noun is treated as a verb.
IncorrectCorrect
The material is combustion. The material is combustible.
The engine combustions fuel. The engine burns fuel.
Combustion is when fuel cools down. Combustion releases heat.
The fuel needs oxygen for combust. The fuel needs oxygen for combustion.

Similar words

burning
oxidation
incineration
ignition
combustion reaction

Violent unrest or turmoil

noun
social
formal
A state of intense agitation, conflict, or public turmoil that seems to flare up like a fire.

Usage

Use combustion in this figurative sense for large, intense social or political unrest, not for a mild disagreement.

Examples

  • The scandal produced a season of political combustion.
  • The novel captures a city in social combustion.
  • Years of economic strain brought the region to combustion.
  • Commentators described the protests as social combustion.
  • The reform debate exposed the combustion beneath the party's calm surface.
  • The empire entered a period of combustion after the succession crisis.

Common mistakes

The metaphor is made too casual or used for a small disagreement, ordinary growth, or weak excitement.
IncorrectCorrect
The team had a combustion about lunch. The team had a disagreement about lunch.
The market saw a combustion of prices. The market saw a surge in prices.
The protest was combustioned by the speech. The protest was ignited by the speech.
Their calm caused a combustion. Their anger caused an outburst.

Similar words

tumult
turmoil
agitation
unrest
upheaval
eruption
flare-up

Usage

Use combustion mainly for the process of burning in science, engines, and fires. The figurative sense is formal and uncommon.

Common mistakes

Combustible is used for a material that can burn, while combustion names the burning process.

Etymology

From Middle English combustioun, borrowed through Anglo-French and Old French from Late Latin combustio, from Latin comburere, "to burn up or consume."

FAQ

What does combustion mean?

Combustion means the process or act of burning, usually a chemical reaction that releases heat and often light.

Is combustion the same as burning?

Burning is the everyday word, while combustion is the more technical word for the process behind it.

What is needed for combustion?

Most combustion needs fuel, an oxidizer such as oxygen, and enough heat to start the reaction.

What does complete combustion produce?

Complete combustion of a hydrocarbon fuel mainly produces carbon dioxide, water, and heat.

Can combustion happen without a visible flame?

Yes. Some forms, such as smoldering or catalytic combustion, can release heat without a bright flame.

Can combustion be figurative?

Yes. In formal writing, combustion can describe violent social agitation or turmoil.

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