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GCSE Combined Science · key term
Water in its gaseous state.
Used by AQA and Edexcel
Specification 5.9.1.1 · Paper 4
Revise: Atmospheric Gas ProportionsThe atmosphere also contains small proportions of carbon dioxide, water vapour and noble gases. Water vapour is water in its gaseous state, so it is part of the gas mixture rather than liquid water droplets.
Specification Earth and atmospheric science · Paper 3, Paper 4
If asked to name other atmospheric gases, give carbon dioxide, water vapour and noble gases.
Distinguish condensation from dissolving: water vapour condenses to form liquid water, then carbon dioxide dissolves in that water.
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Scientists think this atmosphere contained a large amount of carbon dioxide and water vapour, with little or no oxygen. There were also smaller amounts of other gases, including nitrogen, and possibly methane and ammonia. Nitrogen gradually built up in the atmosphere.