"...we know all atoms to perform all the time a completely disorderly heat motion, which, so to speak, opposes itself to their orderly behavior and does not allow the events that happen between a small number of atoms to enrol themselves according to any recognizable laws. Only in the co-operation of an enormously large number of atoms do statistical laws begin to operate... All the physical and chemical laws that are known to play an important part in the life of organisms are of this statistical kind; any other kind of lawfulness and orderliness that one might think of is being perpetually disturbed and made inoperative by the unceasing heat motion of the atoms..." -Erwin Schrödinger, What Is Life?, 1944
Setting up the model
To change the size of the opening click on change wall; The size is controlled by the hole-size slider beneath.
Running the model
go runs the model; the model can be stopped by unclicking the button. step advances the model by one time frame.
A single particle can be tracked by clicking follow/don't follow; to return to the normal view click the button again.
To control the "temperature" of the particles on either side use the temp-left and temp-right sliders above the model.
The distribution of total particles is shown in percentage form in % left/% right and is also graphed in the distribution plot.
Applet by Laura Cyckowski and Paul Grobstein, posted 9 July2008. Applet created using NetLogo , the availability of which is gratefully acknowledged.