water vapor

Definitions

1. Water in a gaseous state, especially when diffused in the atmosphere.
   countable, uncountable
2. Steam.
   countable, uncountable

Equivalents

Examples

“Water vapor was found in the atmosphere of K2-18b, one of hundreds of "super-Earths" - worlds ranging in size between Earth and Neptune - documented in a growing new field of astronomy devoted to the exploration of so-called exoplanets elsewhere in the Milky Way galaxy.”

CEFR level