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STP PartitionedBox Model
written by Wolfgang Christian, Anne Cox, Harvey Gould, and Jan Tobochnik
The Partitioned Box program displays the number of particles on one half of a box as a function of time after a small hole is made in the partition dividing the box in half. The purpose of this simulation is to gain insight into the tendency of macroscopic systems to approach a well defined equilibrium macrostate and the importance of fluctuations in equilibrium. The program is distributed as a ready-to-run (compiled) Java archive. Double-clicking the ejs_stp_PartitionedBox.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
- General
- Kinetic and Diffusive Processes
= Approach to Equilibrium
- Lower Undergraduate
- Upper 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, osp
Record Creator:
Metadata instance created May 30, 2008 by Anne Cox
Record Updated:
June 12, 2014 by Andreu Glasmann
Last Update
when Cataloged:
May 29, 2008
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
W. Christian, A. Cox, H. Gould, and J. Tobochnik, Computer Program STP PARTITIONEDBOX MODEL (2008), WWW Document, (
W. Christian, A. Cox, H. Gould, and J. Tobochnik, Computer Program STP PARTITIONEDBOX MODEL (2008), <>.
APA Format
Christian, W., Cox, A., Gould, H., & Tobochnik, J. (2008). STP PartitionedBox Model [Computer software]. Retrieved May 22, 2024, from
Chicago Format
Christian, W, A. Cox, H. Gould, and J. Tobochnik. "STP PartitionedBox Model." (accessed 22 May 2024).
MLA Format
Christian, Wolfgang, Anne Cox, Harvey Gould, and Jan Tobochnik. STP PartitionedBox Model. Computer software. 2008. Java 1.5. 22 May 2024 <>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian and Anne Cox and Harvey Gould and Jan Tobochnik", Title = {STP PartitionedBox Model}, Month = {May}, Year = {2008} }
Refer Export Format

%A Wolfgang Christian %A Anne Cox %A Harvey Gould %A Jan Tobochnik %T STP PartitionedBox Model %D May 29, 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 29, 2008 %T STP PartitionedBox Model %8 May 29, 2008 %U

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Citation Source Information

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

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STP PartitionedBox Model:

Covers the Same Topic As STP Approach To Equilibrium 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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