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Ans: The other factors which affects the diffusion rate are temperature (by increasing temperature diffusion rate increases), medium of diffusion (dense is the medium lower is diffusion), concentration gradient (higher is concentration is lead to greater diffusion).
Que4. What causes diffusion to occur?
Diffusion occurs to achieve equilibrium. A difference in concentration gradients causes the diffusion. Concentration gradient is basically a difference in concentrations. Particles move from higher concentrated areas to lower concentrated area to achieve equilibrium. As long as there is a difference in the concentration gradient (or basically difference in concentration of two things/areas), diffusion will occur to "balance out" the sides.
Que5. Does diffusion occur fastest in semi-solid, liquid or gas?
Ans: Diffusion occurs fastest in gas then liquid and then semisolid....