Why do warm air and cold air change the weather?
Air's Weather Dance
Why do warm air and cold air change the weather?
You know how sometimes the sky is bright and calm, and other times it's windy or rainy or stormy? It all starts with something invisible: air that's warm bumping into air that's cold. When these two types of air meet, they don't just sit there politely — they throw a whole atmospheric party, and we call the results "weather."
First, you need to know this: warm air is lighter than cold air. Heat makes air molecules bounce around faster and spread out, like popcorn kernels jumping in a pan. Cold air molecules move slowly and pack together tight, like marbles in a jar. So warm air floats up, and cold air sinks down.
