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Ejs STP LJFluid2D Model
written by Wolfgang Christian, Anne Cox, Harvey Gould, and Jan Tobochnik
The Lennard-Jones Fluid 2D program shows a system of particles in two dimensions interacting via the Lennard-Jones potential. The program displays the particles in the box as a function of time once the partition dividing the box into three parts are removed. The program is distributed as a ready-to-run (compiled) Java archive. Double-clicking the ejs_stp_LJFluid2D.jar file will run the program if Java is installed on your computer.

The program was created using Ejs (Easy Java Simulations). You can modify this program and see how it is designed if you have Ejs installed by right-clicking within the window and selecting Open Ejs Model from the pop-up menu. Ejs, a part of the Open Source Physics Project, is designed to make it easier to access, modify, and generate computer models. Information about Ejs is available at

Additional Open Source Physics programs for Statistical and Thermal Physics can be found by searching ComPADRE for Open Source Physics, STP or Statistical and Thermal Physics.

Please note that this resource requires at least version 1.5 of Java.
2 supplemental documents are available
1 source code document is available
Subjects Levels Resource Types
Thermo & Stat Mech
- Models
= Lennard-Jones Potential
- Second and Third Law
= Second Law Formulations
- Upper Undergraduate
- Lower Undergraduate
- Instructional Material
= Activity
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
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Access Rights:
Free access
© 2008 Wolfgang Christian
Additional information is available.
computational modeling, diffusion, diffusive equilibrium, equilibrium, osp
Record Creator:
Metadata instance created May 30, 2008 by Anne Cox
Record Updated:
June 5, 2014 by Andreu Glasmann
Last Update
when Cataloged:
May 30, 2008
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
W. Christian, A. Cox, H. Gould, and J. Tobochnik, Computer Program EJS STP LJFLUID2D MODEL (2008), WWW Document, (
W. Christian, A. Cox, H. Gould, and J. Tobochnik, Computer Program EJS STP LJFLUID2D MODEL (2008), <>.
APA Format
Christian, W., Cox, A., Gould, H., & Tobochnik, J. (2008). Ejs STP LJFluid2D Model [Computer software]. Retrieved June 24, 2024, from
Chicago Format
Christian, W, A. Cox, H. Gould, and J. Tobochnik. "Ejs STP LJFluid2D Model." (accessed 24 June 2024).
MLA Format
Christian, Wolfgang, Anne Cox, Harvey Gould, and Jan Tobochnik. Ejs STP LJFluid2D Model. Computer software. 2008. Java 1.5. 24 June 2024 <>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian and Anne Cox and Harvey Gould and Jan Tobochnik", Title = {Ejs STP LJFluid2D Model}, Month = {May}, Year = {2008} }
Refer Export Format

%A Wolfgang Christian %A Anne Cox %A Harvey Gould %A Jan Tobochnik %T Ejs STP LJFluid2D Model %D May 30, 2008 %U %O application/java

EndNote Export Format

%0 Computer Program %A Christian, Wolfgang %A Cox, Anne %A Gould, Harvey %A Tobochnik, Jan %D May 30, 2008 %T Ejs STP LJFluid2D Model %8 May 30, 2008 %U

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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

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Ejs STP LJFluid2D Model:

Covers the Same Topic As STP MD Approach To Equilibrium Three Partitions Program

The Open Source program, part of a package of resources for Statistical and Thermal Physics, provides a similar simulation.

relation by Anne Cox
Is Based On Easy Java Simulations Modeling and Authoring Tool

The Ejs tool is needed to explore the computational model.

relation by Anne Cox

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