## Detail Page

Hard Disk PVT System Model
written by Wolfgang Christian
The Hard Disk PVT System simulates a two-dimensional system of particles confined between a thermal reservoir and a piston.   This computer model is designed to study the equation of state for hard disks without other interactions.   Slow-moving particles are color-coded as blue and fast particles are color-coded as yellow.  Users can set the initial particle energy, the initial particle separation, and the thermal reservoir temperature Tr.  The thermal conductivity parameter ? determines the probability that a collision with the thermal wall will affect (thermalize) the colliding particle.  If the conductivity is one, the particle velocity after a reservoir collision is set according to Maxwell-Boltzmann statistics.  If the conductivity is zero, all reservoir collisions are elastic and the internal energy E of the system is conserved.

Particles in this model have unit mass and interact through contact forces.  Collision times are computed analytically because particles and pistons move with constant velocity between collisions. The time evolution algorithm advances the particle and piston positions from collision to collision until the requested time step ?t is achieved.  The time evolution is then paused, data is accumulated, and the screen is redrawn.

The Hard Disk PVT model is a supplemental simulation for the article "Pressure Oscillations in Adiabatic Compression" by Roland Stout in The Physics Teacher 49(5), 280-281 (2011) and has been approved by the author and The Physics Teacher editor.  The model was developed using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the  ejs_stp_hd_HardDiskPVTSystem.jar file will run the program if Java is installed.

Please note that this resource requires at least version 1.5 of Java.
1 source code document is available
Subjects Levels Resource Types
Mathematical Tools
- Probability
- Statistics
Thermo & Stat Mech
- Kinetics and Dynamics
= Kinetic Theory
- Models
= Ideal Gas
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
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Access Rights:
Free access
Program released under GNU-GPL. Narrative is copyrighted.
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Wolfgang Christian
PACSs:
01.50.hv
07.05.Tp
05.10.-a
Keyword:
statistical mechanics
Record Cloner:
Metadata instance created March 12, 2011 by Wolfgang Christian
Record Updated:
October 26, 2014 by Wolfgang Christian
Last Update
when Cataloged:
March 12, 2011
Other Collections:

### AAAS Benchmark Alignments (2008 Version)

#### 4. The Physical Setting

4E. Energy Transformations
• 6-8: 4E/M4. Energy appears in different forms and can be transformed within a system. Motion energy is associated with the speed of an object. Thermal energy is associated with the temperature of an object. Gravitational energy is associated with the height of an object above a reference point. Elastic energy is associated with the stretching or compressing of an elastic object. Chemical energy is associated with the composition of a substance. Electrical energy is associated with an electric current in a circuit. Light energy is associated with the frequency of electromagnetic waves.

### AAAS Benchmark Alignments (1993 Version)

#### 4. THE PHYSICAL SETTING

E. Energy Transformations
• 4E (9-12) #2.  Heat energy in a material consists of the disordered motions of its atoms or molecules. In any interactions of atoms or molecules, the statistical odds are that they will end up with less order than they began?that is, with the heat energy spread out more evenly. With huge numbers of atoms and molecules, the greater disorder is almost certain.
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AIP Format
W. Christian, Computer Program HARD DISK PVT SYSTEM MODEL, Version 1.0 (2011), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10855&DocID=2192).
AJP/PRST-PER
W. Christian, Computer Program HARD DISK PVT SYSTEM MODEL, Version 1.0 (2011), <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10855&DocID=2192>.
APA Format
Christian, W. (2011). Hard Disk PVT System Model (Version 1.0) [Computer software]. Retrieved May 26, 2018, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10855&DocID=2192
Chicago Format
Christian, Wolfgang. "Hard Disk PVT System Model." Version 1.0. https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10855&DocID=2192 (accessed 26 May 2018).
MLA Format
Christian, Wolfgang. Hard Disk PVT System Model. Vers. 1.0. Computer software. 2011. Java 1.5. 26 May 2018 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10855&DocID=2192>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Hard Disk PVT System Model}, Month = {March}, Year = {2011} }
Refer Export Format

%A Wolfgang Christian
%T Hard Disk PVT System Model
%D March 12, 2011
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Christian, Wolfgang
%D March 12, 2011
%T Hard Disk PVT System Model
%7 1.0
%8 March 12, 2011

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### Hard Disk PVT System Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Hard Disk PVT System Model.

relation by Wolfgang Christian

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