Similar to the diffusion of a contaminant, such as plutonium, through a clay layer in the subsurface vadose zone. To simplify the problem, consider only a one-dimensional system. Here, the surface area. Diffusion occurs normal to the plane in the positive and negative x directions.
a. Calculate and plot the concentration profile for liquid diffusion as a function of distance for periods of 1, 10, 100, and 1000 years, assuming an initial mass loading of 0.1 kg/m^2. The diffusion coefficient is 10^- m^2/s for liquids.
b. Calculate and plot the concentration profile for vapor diffusion for periods of 1 hour, 1 day, 1 week, 1 month, and 1 year, assuming an initial mass loading of 0.1 kg/m^2. The diffusion coefficient is 10^- m^2/s for gases.