Note: The timer stops at the first moment when the number of particles on that colour is the same in either side of the particle box.
Demonstrations:
Experiment options:
Membrane thickness: 0 px
Perimeter: 7.47 cm
Area: 4.40 cm²
P / A: 1.70
Data collection settings:
Data collection mode:
Scarecrow explains
Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration because the particles are moving randomly all the time.
In Basic mode, the app shows how random motion gradually reduces a concentration gradient until the particles become evenly spread.
In Experiment mode, the app lets you test how membrane thickness, surface area and fluid flow alter the rate at which diffusion happens.
The automated experiment tools help you collect repeatable data rather than relying on a single run.