Homemade clouds
You can make a cloud! In fact, you probably have made clouds many, many
times. All you need is a cold day.
Just open your mouth and blow a puff of breath into the cold air. For
just a moment, you’ll see a cloud. It’s only a tiny, smoky, whitish
patch in the air. But it’s a real cloud.
Clouds are made when warm, moist air hits cold air. That’s what happens
when you breathe on a cold day. Your breath is warm from being inside
your warm body. And your breath is full of water vapor—water in the
form of a gas. When your breath hits the cold air, the water vapor
instantly turns into many tiny droplets of water. The droplets form a
cloud, just like the clouds in the sky. But the cloud is so tiny that it
quickly spreads out and vanishes in the air.
