Atmospheric thermodynamics is the study of what heat does in the Earth's atmosphere. It tells us about how air around us behaves when it gets hot or cold. To put it simply, when something gets hot it rises, like hot air balloons or a hot-air popcorn maker. On the other hand, when something gets cold, it sinks, like a cold drink or an ice cube in a glass of water. Atmospheric thermodynamics is an important way to learn and understand why things happen in the sky, like clouds forming, or hot and cold front moving through. It helps us have a better understanding of weather and how it works.