How can clouds stay in the sky?
On a frosty morning, you can sometimes see for yourself how this magic works. Fill your lungs and then puff. If the weather is just right, you can see your breath hanging in the air like a misty fog. The air gathered moisture from your lungs. When you breathed out, this moisture became drops of water fine enough to hang in the air and make a little cloud. A fluffy cloud is made of water. And water falls to the ground because it is heavier than the air. The water in a cloud may weigh as much as 20 houses, yet it floats on high like a flying carpet. This is because all that water is divided into fine droplets light enough to hang in the air. Chances are, a cloud was born high above the ground. It was born because the air is thirsty. The air drinks up water from the seas and rivers, from the lakes and even from the wet laundry on the line. All this water evaporates and becomes gas vapor. If the air is warm, it rises aloft with its load of vapor. When the warm air rises a few miles, it bec
