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H2O

H2O

In common parlance, water vapor is usually understood to mean the visible vapor clouds of condensed water vapor (wet vapor). Vapor plumes are visible because microscopic droplets (aerosols) have formed, as in clouds and fog. In technology and science, steam is the term for water in its gaseous state of aggregation. The content (concentration) is also referred to as humidity and is expressed in % relative humidity, absolute humidity (mg/m3 ) or vol.-% or ppm.
Exhaust gases containing water vapor condense to form white exhaust gas plumes, i.e. “steam” escapes from the chimney. Sooty black or gray exhaust gases, on the other hand, are referred to as smoke.

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