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Subjects
Class 12GeographyWater in the AtmosphereHumidity, evaporation, and condensationExpertLevel 85

Moist air can be less dense than dry air. What is the correct scientific basis?

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Answer and explanation

Correct answer: The molecular weight of water vapour is lower than that of average dry air

Water vapour replaces some heavier nitrogen and oxygen molecules. Exam tip: do not assume moist air is automatically heavier.

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moist airdensitymolecular weight

Frequently asked questions

What is the correct answer to this question?

The molecular weight of water vapour is lower than that of average dry air

Why is this the correct answer?

Water vapour replaces some heavier nitrogen and oxygen molecules. Exam tip: do not assume moist air is automatically heavier.

Which subject and chapter does this question cover?

This is a Class 12 Geography question. Chapter: Water in the Atmosphere. Topic: Humidity, evaporation, and condensation.

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