The following link is a downloadable molecular dynamics application that runs on Power Macintoshes. It is similar in appearance to the above Java applet but is faster and can simulate many more particles, and allows the user to control temperature, pressure, number and size of the particles, etc. It will also calculate statistical averages in different thermodynamic ensembles.
Teachers can use it to demonstrate the physical origins of pressure, temperature, density, etc.
MolecularDynamics1.2.sit.hqx I am working on adding those same features to the Java version. Keep checking back to this web site. My general field of research is the thermodynamics and statistical mechanics of condensed matter systems. My recent work includes a calculation of the exact distribution of energies in the two-dimensional Ising model. Since the coefficients of the low-temperature series give the number of different states with a given energy, one can use the coefficients to calculate the exact distribution of energies at any specified temperature.