The addition of water vapor will cause the density of air to:

Name: The addition of water vapor will cause the density of air to:
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Adding water vapor to air will cause the density of air to decrease because a molecule of water vapor weighs less than a molecule of nitrogen or oxygen, which are the two primary components of air. As a result, the total mass of air and water vapor will be less than the mass of dry air alone, leading to decreased density.

The Addition of Water Vapor Will Cause the Density of Air