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water vapour

British  

noun

  1. 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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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

As the air rises, it cools and the water vapour condenses into a cloud.

From BBC Jul. 27, 2026

These are actually condensed water vapour trails - known as contrails - that come from the jet engines of planes.

From BBC Jul. 20, 2024

The condenser, by effecting the condensation of water vapour, also brings about the deposition of solid naphthalene, apart from that which naturally condenses owing to reduction of temperature.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" by Various

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