NetLogo Models Library:
This model is illustrates the relationship between temperature and pressure in a fixed volume gas container.
This model is one in a series of GasLab models. They use the same basic rules for simulating the behavior of gases. Each model integrates different features in order to highlight different aspects of gas behavior.
The basic principle of the models is that gas particles are assumed to have two elementary actions: they move and they collide --- either with other particles or with any other objects such as walls.
This model is part of the Connected Mathematics "Making Sense of Complex Phenomena" Modeling Project.
The particles are modeled as hard balls with no internal energy except that which is due to their motion. Collisions between particles are elastic.
As the walls of the box are heated, the sides of the walls will change color from a deep red (cool) to a bright red, to pink to a pale pink white (hot). The walls contain a constant heat value throughout the simulation. If ONE-SIDE? is set to ON, only the left wall will be heated, while the other three walls remain yellow.
The exact way particles gain energy from the walls of the box is as follows: 1. Particles check their state of energy. 2. They hit or bounce off the wall. 3. They find wall energy and recalculate their new energy. 4. They change their speed and direction after the wall hit.
The SETUP button will set these initial conditions. The GO button will begin the simulation.
How does adding heat to the box walls affect the pressure?
How does adding heat to the wall affect the particle behavior?
How does the particle behavior or system response change with only one wall heated instead of all walls heated?
Does the system reach an equilibrium temperature faster when the wall is heated or cooled the same amount in comparison to the temperature of the particles?
Try to get the inside temperature to reach the outside temperature. Is this possible?
Try to increase the wall hits per particle.
Give the wall a mass and see how that affects the behavior of the model.
Close off the right side of the box. Create two valves on either side to the wall that allow the user to "spurt" particles into the chambers to see how number of particles affects pressure.
Vary the width and length of the box, does this effect how fast the particle temperature changes?
Notice how the collisions are detected by the turtles and how the code guarantees the same two particles do not collide twice. What happens if we let the patches detect them?
This model was developed as part of the GasLab curriculum (http://ccl.northwestern.edu/curriculum/gaslab/) and has also been incorporated into the Connected Chemistry curriculum (http://ccl.northwestern.edu/curriculum/ConnectedChemistry/)
If you mention this model or the NetLogo software in a publication, we ask that you include the citations below.
For the model itself:
Please cite the NetLogo software as:
Copyright 2002 Uri Wilensky.
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License. To view a copy of this license, visit https://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
Commercial licenses are also available. To inquire about commercial licenses, please contact Uri Wilensky at email@example.com.
This model and associated activities and materials were created as part of the project: MODELING ACROSS THE CURRICULUM. The project gratefully acknowledges the support of the National Science Foundation, the National Institute of Health, and the Department of Education (IERI program) -- grant number REC #0115699. Additional support was provided through the projects: PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and/or INTEGRATED SIMULATION AND MODELING ENVIRONMENT -- NSF (REPP & ROLE programs) grant numbers REC #9814682 and REC-0126227.