When you see a cloud hanging in a clear blue sky, it looks
like the cloud is wet, while the air around it is dry.
That's what you see, but that would be wrong.
The truth is, moisture is everywhere, whether you see it or
not. Most of the time, it's floating about like vapor, it's a gas. Gaseous
water is invisible. But when it becomes a liquid, that's when you see it.
In a nutshell, this is how a cloud is born. A cloud happens,
wrote the great illustrator Eric Sloane, when moisture goes "from
invisible gas to visible water droplets."
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