Hot and Cold Ideal Gasses

This simulation uses Easy Java Simulations (Ejs) to model the mixture of two ideal gasses in a rectangular box. Initially the hot gas (green) is confined to the left side of the box, while the colder gas (black) is confined to the right side. On each side particles are initially spread throughout that side of the box with random positions and random velocities (with a Maxwell distribution of speeds). The top view shows an animation of the motion of the particles in the box, while the lower view shows plots of the temperature of the gas on each side of the box (red=left, blue=right) as a function of time.

Controls:

Play/Pause: starts (or stops) the simulation.
Step: advances the simulation by one time step.
Reset: resets simulations with initial parameter values.
Erase: erases the plot.
Reverse: reverses the velocity of all particles.
N(green): sets the number of molecules in the hot gas (up to 500).
N(black): sets the number of molecules in the cold gas (up to 500).
Speed (fps): slider to control the speed of the simulation, in terms of the number of frames displayed per second. Higher values make the simulation run faster.

Units are defined so that Boltzmann's constant, the mass of each particle, the length of the box, and the absolute temperature of the whole gas are all equal to one.