Weather Science Fair Projects, Revised and Expanded Using the Scientific Method by Robert Gardner

Author:Robert Gardner [Calhoun, Yael]
Language: eng
Format: epub
ISBN: 978-1-4645-0105-0
Publisher: Enslow Publishers, Inc.
Published: 2010-10-15T00:00:00+00:00

Humidity and Density of Air

People often say humid air is “heavy,” suggesting that humid air is denser than dry air. In fact, just the opposite is true. As your weather records have probably shown, damp air is often accompanied by low barometric (atmospheric) pressure. Air containing water vapor is less dense than dry air—and for a very good reason.

As any chemist will tell you, equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. Water molecules weigh less than oxygen, nitrogen, and argon molecules. In damp air, water molecules have taken the place of some of the oxygen, nitrogen, and argon molecules. Consequently, a volume of humid air weighs less than an equal volume of dry air.

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