water vapour

British

noun

water in the gaseous state, esp when due to evaporation at a temperature below the boiling point Compare steam

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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water vapour

It starts off as a cute little white cloud -- a cumulus cloud, which is formed because water vapour has turned into tiny droplets.

From Barron's ● Jul. 27, 2026

As the Sun heats the ground, the water vapour suddenly condenses.

From Barron's ● Jul. 27, 2026

The colder the air gets the less water vapour it is able to contain.

From BBC ● Mar. 20, 2026

The fewer trees there are, the less water vapour is emitted to create rain for their crops - which some farmers burn their land to make room for.

From BBC ● Oct. 3, 2024

The existence of water vapour is clearly shown by photographs of the planet’s spectrum taken by Mr. Slipher at the Lowell Observatory in 1908.

From Astronomical Curiosities Facts and Fallacies by J. Ellard Gore

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023