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Understanding Diffusion
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Understanding Diffusion
The process of diffusion is the natural outcome of the simple motion of individual molecules moving in a straight line until they collide with something. Think about each statement below as it relates to the models you are observing.
Diffusion involves the movement of particles, such as atoms or molecules.
All atoms and molecules are in constant motion.
Diffusion results from random motion and collisions of particles.
Diffusion is the net movement of particles from an area of high concentration (number of particles per unit area) to low concentration.
Diffusion continues until the particles become uniformly distributed.
What a molecular dynamics model of diffusion should show:
Key components: The model needs to show molecules. Even though molecules consist of more than one atom, a gas molecule can be represented by a single particle for simplicity. The behavior or the gases will be virtually the same.
Starting conditions:The model should exhibit some characteristic of what is being modeled as well as some actions that represents some processes being modeled.
Ability to change variables: To answer a question, you should be able to change some properties of the model and observe the resulting behavior. In this model you should be able to change concentrations of the different substances and the temperature.
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