Diffusion process

Objective:

  • To show the interaction between two different gases
  • Factors affecting the diffusion process

Virtual experiment 

The Diffusion Simulator allows students to explore how two gases mix. Experiment with concentration, temperature, mass, and radius to determine how these factors affect the rate of diffusion. Use the center of mass and particle flow rate to determine when the system reaches equilibrium.

The figure below shows the functions each button performs.

Workflow:

Step 1. Open the data section. Here you can track the particle count and temperature for each side.

Step 2. Add additional data to the screen:

  • Center of mass,
  • Particle flow rate,
  • Scale,
  • Stopwatch.

Step 3. Place the particles in the box.

Step 4. Remove the partition separating the box to begin the diffusion process. Turn on the stopwatch. Observe how long it takes for the particles to diffuse evenly inside the box.

Step 5. Monitor the flow of particles between the sides using the scale below the box.

Step 6. Repeat the diffusion process from the beginning, but with different parameter values for the particles. You can start the process again by pressing the orange colored button.

Step 7. Change the blue particle parameters to your liking.

Step 8. Change the red particle parameter values by setting different values than the blue particles.

Step 9. Remove the divider separating the box to begin the diffusion process. Turn on the stopwatch. Observe how long it takes for the particles to diffuse evenly inside the box.

Step 10. Monitor the flow of particles between the sides using the scale below the box.

Step 11. Compare and analyze:

  • How did the diffusion process occur when the particle parameters were the same?
  • How did the diffusion process occur when the particle parameters were different?
  • What were the differences?
  • Make conclusions.

Conclusion

The simulator demonstrated the diffusion process between different gases and the effect of particle parameters on it.