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What is the primary reason that water vapour rises in the air?

Answer and explanation

Correct answer: At the same temperature and pressure, water vapour is less dense than dry air

Correct answer: B. Water vapour has a lower molecular mass than the main gases in dry air, so at the same temperature and pressure, a volume of water-vapour-containing air can be less dense than dry air. Warm air also tends to rise because heating causes expansion and lowers density; convection can therefore carry water vapour upward. The safest idea is not that every parcel of moist air always rises, but that buoyancy and atmospheric convection can lift water vapour. A is incorrect because water vapour is not heavier than dry air under the stated comparison. C is wrong because gravity pulls matter downward, although it helps shape atmospheric pressure and motion. D is not a physical force. Memory cue: lower density plus convection can carry vapour upward.

Related tags

Water-VapourDensityConvectionAtmosphereHydrological CycleThe Living WorldBiologyClass 11 Mcq

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