Clouds are important features for determining weather. Cloud formation requires that the air be saturated (100% humidity) and requires the presence of condensation nuclei, which are 0.2-µm particles such as dust, pollen, sea salt, or smoke. As warm air rises and cools, water vapor condenses around condensation nuclei and a cloud begins to form. The activity supports 3-dimensional learning and builds toward the following:

• NGSS Scientific and Engineering Practice: Developing and Using Models
• NGSS Core Idea: Earth and Space Science 2: Earth’s Systems