Select a mode (top left): - Basic mode shows particles diffusing across a simple vertical membrane. - Cell mode shos particles diffusing into or out of a simple circular cell.
Choose your settings: - The 'Total particles' slider sets the total number of particles in the simulation between 0 and 2000, distributed evenly (by area) by the two regions on each mode. - The Left/Right and Inside/Outside sliders change the composition of each region - sliding them to the right increases the proportion of solute molecule and decreases the proportion of waters. - The 'Temperature' slider increases the temperature, making the particles move faster.
Run the simulation: - Click the 'Run' button to start, pause or continue the simulation. - Toggle the 'Gradient arrows' button to show the direction of the water concentration gradient. - Toggle the 'Dynamic membrane/cell size' button to allow the membrane to move until the concentrations are equal on either side of the membrane. - Toggle the 'Initial state' button to flip between the intial and current states of the simulation so you can see the change.
Graph: - The is shows the water concentration in each region before and after so you can see how it has changed. - Toggle the 'Hide graph' button to hide it if you don't want this information visible.
Run
00:00.0
Total particles
1200 particle-units (H₂O=1, solute=9)
Left side
600 H₂O · 0 solute
Right side
600 H₂O · 0 solute
Temperature
25 °C
Water concentration (Start vs Now) — Left vs Right
Rigid circles • Constant velocity between collisions • Elastic collisions. Water crosses membrane; solute does not.