Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport, without requiring bulk motion. Thus, diffusion should not be confused with convection, or advections, which are other transport mechanisms that utilize bulk motion to move particles from one place to another. In Latin, "diffundere" means "to spread out". There are two ways to introduce the notion of diffusion: either a phenomenological approach starting with Fick's laws of diffusion and their mathematical consequences, or a physical and atomistic one, by considering the random walk of the diffusing particles. Diffusion is the process by which a characteristic spreads across space from one place to another over time. It is the process of dissemination. Diffusion causes ideas and different cultural customs to be spread from one place to another. This makes the world more culturally diverse. There are many types of diffusion: contagious, hierarchical, stimulus, and relocation. These types of diffusions are seen in trends, ideas, transportation, and communication systems. For example, it allows the world to watch events on television and transportation to travel and spread ideas from place to place.
Forms of Expansion Diffusion
Expansion diffusion is idea or innovation spreads outward from the hearth.
Contagious diffusion is the rapid, widespread diffusion of a characteristic throughout the population. Ideas that are spread through contagious diffusion are spread throughout the population like the flue would. It starts with one person or place and it keeps spreading until it is worldwide. Ideas that spread through contagious diffusion start in a populated area, then other cities adopt the idea and it keeps spreading from there. Unlike hierarchical diffusion, everyone picks up on the trend and idea around the same time causing it to become contagious, like a wave on the crowd. It...