Flexi Says: Clouds form when water vapor condenses around particles in the air. The particles are specks of matter, such as dust or smoke. Billions of these tiny water droplets come together to make up a cloud. If the air is very cold, ice crystals form instead of liquid water. These particles are very small is size and hence are not pulled down by gravity to a large extent. When water content becomes more, the clouds begin to come down. At the earth, air gets heated by sunlight, this warms the air, it expands and rises up and pushes the clouds back up. Due to the above reasons, the clouds seem to always float as seen from the ground.
