Brownian motion is the constant, random movement of molecules suspended in a fluid.
Write a program that uses the intrinsic random number generator of Fortran 90 to simulate the Brownian motion of a single molecule in a fluid. A.1.3 for information about using the random number generator. Use a 2D grid to follow the motion of the molecule. Assume a molecule at any point within the grid has 9 movement options. The molecule has no preference and will move to any location with equal probability.