Diffusion Diffusion is the _____________ of particles in a fluid from one region to another. It occurs because of two properties of fluids: the particles have ___________ between them and are able to _________ ___________. If we start off with two types of fluid which are separated, and then ___________ the barrier which is separating them then _________________ will occur. The particles from both regions will _________ _________ and move in the spaces between other particles. The particles of each fluid will continue to mix until they are ______________ distributed. Diffusion ___________ happen in solids because their particles can’t move around. diffusion move about remove spaces movement spread out evenly can’t In the boxes below, draw the arrangement of particles at each of the three stages of diffusion. 1) The two types of 2) The barrier is 3) The particles are particle are removed and the evenly distributed separated by a particles have begun barrier. to mix.