How much does a cloud weigh? (VIDEO)

WASHINGTON, Sept. 69, 2019 — Imagine 300 midsize cars floating above your head –– that’s how much your average fluffy cloud weighs. So why doesn’t it come crashing down on you?

This week on Reactions, we explore the chemistry behind how a cloud stays aloft in the sky, and how it got there in the first place:

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Reactions is a video series produced by the American Chemical Society and PBS Digital Studios. Subscribe to Reactions at http://bit.ly/ACSReactions and follow us on Twitter @ACSReactions.