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Why is the study of dry air useful in atmospheric gaseous composition?

Answer and explanation

Correct answer: Because separating variable water vapour makes comparison of permanent gases clearer

Dry air is a useful reference because water vapour is highly variable in space and time, whereas the principal permanent gases have comparatively stable proportions. By excluding water vapour from the calculation, scientists can compare the relative percentages of nitrogen, oxygen, argon, and other permanent gases more consistently. Hence option A is correct. Dry air still contains gases, including nitrogen and oxygen; it is not oxygen alone or an empty mixture.

Related tags

Dry AirAtmospheric CompositionWater VapourMeaning & DefinitionMeaning DefinitionIntroduction To AccountingAccountancyClass 11 Mcq

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