Clouds

A cloud is a large collection of very tiny droplets of water that are so small that they can float in the air. Clouds exist in a variety of types. Each type of cloud forms under certain circumstances of temperature, pressure, and humidity. All air contains water, but near the ground it is usually in the form of an invisible gas called water vapor. When warm air rises, it expands and cools. Cool air can't 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. There are three different groups of clouds: Cirrus, Alto, and stratus clouds. To learn more about clouds, click here!