Figure 4: Evolution of Concentration. (a) The concentration profiles at different time points along the midline of the chamber. The compound is decaying, leading to a non-linear steady-state profile. (b) For a stable compound, a linear concentration profile is obtained in the chamber. (c) Time evolution of the concentration at three different locations in the chamber (Figure 1). The steady state is reached quickly for a decaying compound, as opposed to a stable compound (d).