30 October 2014

Cloud.

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."

Like this:


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