A diffusion model is a mathematical framework used to describe the spread of something through a medium or population over time. It is commonly employed in the fields of physics, chemistry, biology, sociology, and economics.
In physics and chemistry, diffusion models describe the movement of particles through a substance due to random motion. In social sciences, diffusion models may be used to understand the spread of innovations, ideas, or behaviors within a population.
Diffusion models often involve differential equations that describe how the concentration or adoption of a substance or idea changes over time and space.