Hardis is a toy simulation app based on the interaction of "hard disks" (or hard spheres in 3D). The principle of the simulation is that 2 any disks cannot overlpa and collissions between them are prefeclty elastic.

In this particular implementation, some shortcuts were taken and collisions that involved more than 2 disks are not resolved exactly. Moreover, all disks are assumed to have the same mass, regardless of its size. This means that larger discs represent less dense objects.

With this simple logic, is it possible to ilustrate several physical phenomena:

• Thermalization of 2 gases with different temperatures.
• Difussion of a gas inside anothe gas.
• Brownian momvemen.t
• Buoyancy of less dense objects in a more dense fluid.

Most of these cases are already built in as an examples.

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