Applet by Fu-Kwun Hwang

Virtual Physics Laboratory
    Each circle represents a gas molecule.
    N is the total number of molecules in the area.
      Enter value into the Text Field and press RETURN.
    m2/m1 is the mass ratio of red ball to gray ball.
        (Try it, and find out the difference)
    Press + will have a smaller time interval. (faster motion)
    Press - for slower motion.

    Click trace check box to show the trace for one of the molecules (red).

      Click it again to turn it off and clear the screen.
    Right Click to stop the animation, click it again to resume.
        While the animation is stopped, drag the red ball to relocate its position.

    If you click No boundary checkbox,
     particles moving to the right edge will appear at left edge again (No collision with the wall).