Is very interesting simulation prof lookang any way
I modified interface  ;)

Hard Disk Gas model displays a two-dimensional gas made out of hard disks.
Particles are initialized with a speed v=1 in a random direction and move with constant velocity until a collision occurs. 
You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item. 

/htdocs/ntnujava/ejsuser/37048/users/br/ahmed/HardDiskGaswee04_pkg/HardDiskGaswee04.propertiesFull screen applet or Problem viewing java?Add to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(944kB):double click downloaded file to run it. (4 times by 4 users) , Download EJS source (1 times by 1 users) View EJS source