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Vapor vs. Vapour: Know the Difference

Shumaila Saeed
By Shumaila Saeed || Updated on December 25, 2023
Vapor and vapour are the same substance, gaseous forms of liquids or solids, with "vapor" being the American spelling and "vapour" the British spelling.
Vapor vs. Vapour

Key Differences

Vapor is the preferred spelling in American English, while vapour is used in British English. Both terms refer to the same physical phenomenon.
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Nov 30, 2023
In scientific contexts, vapor and vapour are used interchangeably to describe a substance in its gaseous phase. The choice of spelling depends on the regional language norm.
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The difference in spelling reflects the broader linguistic variations between American and British English. Vapor follows American conventions, while vapour aligns with British English.
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Both vapor and vapour originate from the Latin word "vapor," meaning steam or heat. The spelling divergence occurred with the evolution of American English.
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Writers and educators choose vapor or vapour based on their regional language standards. The meaning and usage remain consistent in both forms.
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Comparison Chart

Spelling

American English standard
British English standard
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Usage

Used in the United States
Used in the UK and others
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Scientific Context

Same meaning as vapour
Same meaning as vapor
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Linguistic Origin

American English variation
British English variation
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Literature/Education

Used in American texts
Used in British texts
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Vapor and Vapour Definitions

Vapor

Gaseous form of a substance that is liquid or solid at room temperature
Water turns to vapor when boiled.
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Vapour

The gas phase of a substance below critical temperature
He observed the vapour rising from the hot spring.
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Vapor

A faint trace of something
There was a vapor of suspicion around the event.
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Vapour

Moisture in the air visible as fog or mist
The cold air turned her breath into vapour.
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Vapor

An unstable or transient occurrence
His dreams of wealth vanished into vapor.
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Vapour

A slight or ephemeral thing
Her promise turned out to be mere vapour.
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Vapor

The gaseous state of a substance that is liquid or solid at room temperature.
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Oct 19, 2023

Vapour

A gaseous byproduct of a chemical reaction
The reaction released a harmless vapour.
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Vapor

A faintly visible suspension of fine particles of matter in the air, as mist, fumes, or smoke.
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Vapour

A medically therapeutic steam
Eucalyptus vapour helps clear nasal passages.
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Vapor

A mixture of fine droplets of a substance and air, as the fuel mixture of an internal-combustion engine.
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Vapour

Variant of vapor.
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Vapor

Something insubstantial, worthless, or fleeting.
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Vapour

A visible suspension in the air of particles of some substance
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Vapor

A fantastic or foolish idea.
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Vapour

The process of becoming a vapor
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Vapor

Exhalations within a bodily organ, especially the stomach, supposed to affect the mental or physical condition. Used with the.
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Vapor

A nervous disorder such as depression or hysteria. Used with the.
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Vapor

To fill or cover with vapor
Perfume vapored the room.
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Vapor

To vaporize
“You wished you'd seen one of the monster shots that vapored an atoll way back when” (Don DeLillo).
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Vapor

To give off vapor.
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Vapor

To evaporate
The fog vapored away.
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Vapor

To engage in idle, boastful talk
Vapored on about his accomplishments.
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Vapor

Cloudy diffused matter such as mist, steam or fumes suspended in the air.
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Vapor

The gaseous state of a substance that is normally a solid or liquid.
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Vapor

Something insubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting.
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Vapor

(dated) Any medicinal agent designed for administration in the form of inhaled vapour.
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Vapor

Hypochondria; melancholy; the blues; hysteria, or other nervous disorder.
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Vapor

(obsolete) Wind; flatulence.
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Vapor

(intransitive) To become vapor; to be emitted or circulated as vapor.
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Vapor

(transitive) To turn into vapor.
To vapor away a heated fluid
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Vapor

To emit vapor or fumes.
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Vapor

(intransitive) To use insubstantial language; to boast or bluster.
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Vapor

(transitive) To give (someone) the vapors; to depress, to bore.
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Vapor

Any substance in the gaseous, or aëriform, state, the condition of which is ordinarily that of a liquid or solid.
Vapor is any substance in the gaseous condition at the maximum of density consistent with that condition. This is the strict and proper meaning of the word vapor.
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Vapor

In a loose and popular sense, any visible diffused substance floating in the atmosphere and impairing its transparency, as smoke, fog, etc.
The vapour which that fro the earth glood [glided].
Fire and hail; snow and vapors; stormy wind fulfilling his word.
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Vapor

Wind; flatulence.
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Vapor

Something unsubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting.
For what is your life? It is even a vapor, that appeareth for a little time, and then vanisheth away.
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Vapor

An old name for hypochondria, or melancholy; the blues.
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Vapor

A medicinal agent designed for administration in the form of inhaled vapor.
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Vapor

To pass off in fumes, or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate.
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Vapor

To emit vapor or fumes.
Running waters vapor not so much as standing waters.
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Vapor

To talk idly; to boast or vaunt; to brag.
Poets used to vapor much after this manner.
We vapor and say, By this time Matthews has beaten them.
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Vapor

To send off in vapor, or as if in vapor; as, to vapor away a heated fluid.
He'd laugh to see one throw his heart away,Another, sighing, vapor forth his soul.
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Vapor

A visible suspension in the air of particles of some substance
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Vapor

The process of becoming a vapor
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Vapor

A visible mist or steam
The morning air was filled with the vapor from the lake.
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Vapor

A gas produced by evaporation or sublimation
The tea kettle emitted a steady stream of vapor.
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Repeatedly Asked Queries

Are vapor and vapour interchangeable?

Yes, they are interchangeable but depend on regional spelling norms.
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Does vapour have a smell?

It can, depending on the substance from which it originates.
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Is vapor visible?

Yes, vapor can be visible, like steam from boiling water.
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Can vapour exist at room temperature?

Yes, many substances can produce vapour at room temperature.
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Can vapour be used in therapy?

Yes, certain types of vapours are used in therapeutic treatments.
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Does vapor affect weather?

Yes, water vapor plays a significant role in weather patterns.
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Is vapour different from smoke?

Yes, smoke is a result of combustion, while vapour is from evaporation or sublimation.
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Can vapor be measured?

Yes, vapor pressure and concentration can be measured.
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Do all liquids produce vapour?

Most liquids can produce vapour under the right conditions.
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Is vapor always related to water?

No, vapor refers to the gaseous state of any substance.
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Is vapor a gas?

Yes, vapor is the gas phase of a substance.
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Is vapor compression used in refrigeration?

Yes, vapor compression is a common method in refrigeration cycles.
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Can vapour freeze?

Vapour can condense and then freeze if the temperature is low enough.
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Is vapor harmful?

It depends on the substance; some vapors can be harmful.
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Does vapor contribute to humidity?

Yes, water vapor is a key component of humidity.
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Can vapour cause corrosion?

Yes, certain types of vapour can cause metal corrosion.
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Can vapour be toxic?

Some vapours, like those from chemicals, can be toxic.
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Can vapour conduct electricity?

Generally, no, unless it contains ionized particles.
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Is vapor pressure significant in meteorology?

Yes, vapor pressure is a critical factor in meteorological studies.
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Is vapor density important?

Yes, vapor density is important in various scientific calculations.
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Shumaila Saeed
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Shumaila Saeed
Shumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.

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