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WASHINGTON, Nov. 29, 2018 � Meteorologists often report the amount of moisture in the air as relative humidity or dew point. These measures can be confusing to people who are just trying to determine if the weather outside will feel comfortable. Both relate to the chemistry of water dissolving in air, but in different ways. In this video, Reactions decodes these weather terms to help you make sense of the forecast: .

Reactions is a video series produced by the American Chemical Öйú365betÖÐÎĹÙÍø and PBS Digital Studios. Subscribe to Reactions at and follow us on Twitter .

The American Chemical Öйú365betÖÐÎĹÙÍø, the world’s largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.