How much does a cloud weigh

Credit: American Chemical Society.

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:

Reactions is a video series produced by the American Chemical Society and PBS Digital Studios.

The American Chemical Society, 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.