1. [Law of Diffusion] According to the law of diffusion, particles in a gas will move in the direction which decreases the concentration the quickest. We have a. be); {in the region 0 g any, 2 g 10) of particles and the concentration (in ppm) of particles in the box is modeled by 22 C 1 I : (a: y 2) 1+12+y2 (a) A particle at the point {2, 114] will move in what direction? [Give your answer as a unit vector.) (b) Are there any positions in the box where the particles will move vertically