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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The addition of water vapor (also known as humidity) causes the air to become less dense (i.e. decrease in density) because the water molecules displace some of the nitrogen, oxygen, and other gases in the air. This causes the overall mass of the air molecules to decrease, resulting in a decrease in density.

The Addition of Water Vapor Will Cause the Density of Air