- States of Matter
Cloud formation is part of the water cycle, but one we usually cannot see up close. In this demonstration, students directly observe a cloud form right before their eyes.
A cloud is a large collection of very tiny water droplets or ice crystals. The droplets are so small and light that they can float in the air. When warm air rises, it expands and cools. Cool air cannot hold as much water vapor as warm air, so some of the vapor condenses onto tiny pieces of dust that are floating in the air and forms a tiny droplet around each dust particle. When billions of these droplets come together they become a visible cloud.