Abstract:Diffusion minute intervals. After measuring the changesAbstract:Diffusion minute intervals. After measuring the changes

Abstract:Diffusion can be simply defined as the movement of solvent molecules from a low concentration to a high concentration of a solute, the objective of diffusion is to reach equilibrium or to make everything equal in concentration.Diffusion is an attribute that has many uses within any engineering science field, one of the many useful examples of diffusion is to filter water, transfer of energy within human cells (ATP).Our objective in this lab is to determine the diffusion constant of two given dyes. The team added two dyes onto a hydrated porous material known as agar, then observed the changes in dye over time by measuring the diameter in one minute intervals. After measuring the changes over 15 minutes, a radius vs  plot is made to observe if the changes are occurring linearly or exponentially, as well as to determine the diffusion constant. The team have used the following relation (1) to determine the slope (diffusion coefficient) (1)              Afterwards, Mathmatica CDF player was used to stimulate different temperatures to determine activation energy.Introduction: This experiment was conducted as material science course requirement. Although it has no personal motivation, it was very interesting to observe the diffusion of dye into the agar. It is expected that both dyes will start to diffuse into the agar as soon as it is carefully dropped. The rate of diffusion should not be significantly different because they are both dyes and are dropped into the same medium. The medium will be placed on a hot platform to increase the rate of diffusion. The diffusion rate will increase in high temperatures because it allows molecules to move faster which results in faster diffusion. The purpose of this experiment is to measure the diffusion constant which is the proportionality constant between molar flux due to molecular diffusion and the gradient in the concentration of the species1, it can be also stated as Fick’s second law:(2)            Method:The methods used for this experiment were referenced from the lms webpage.First, the team prepared all the equipment that were going to be used then set a hotplate surface to 70. Afterwards, the original diameter measurement was taken at t= 0 min. Each dye was dropped into separate well (3-4 drops each) then allowed to diffuse. After every minute, new radius values were measured using calipers. After finishing the radius measurements for 15 minutes, we had enough data to plot the points. Results:The results were mostly expected, as time pass by the radius increases in different rates according to their own diffusion rates.First, we have the PP dye, it had a diffusion rate of 1.4641 m2/s meaning that the radius will increase 1.46 mm in radius each second square rooted.According to the figure, the PP dye had a faster increase rate (slope) than the blue dye. I think it may have to do with the density of these two dyes as denser materials have a slower rate duo to the volume that has to