A dispersion model is just like a science experiment! It's a way to learn how things can be spread out by using experiments with different scenarios. In a dispersion model, a scientist sets up an experiment to see how something moves and spreads out over time. For example, a scientist might use a dispersion model to study the spread of pollution in a river. They would put some pollution in the river, then measure how far the pollution moves and how it changes over time. Dispersion models can also be used to study how diseases spread, how sound moves through air, or how air pollution travels from one place to another.