At first during diffusion of blood in water, particles from the sea and blood do not mix at all, but over time as the partciles move around randomly they begin to mix with one another, eventually spreading out into one another. We say diffusion is complete when they are fully mixed up together, and spread out.
To make diffusion happen quickest you can make a bigger difference between two concentrations before mixing. The difference between concentration is called concentration gradient.
For example- If there was a steep diffusion, then at the beggining of the experiment both concentrations would be in two groups, not mixed together, and then after steep gradient would mix together.
Concentration isnt the only thing that affects diffusion, so does tempeture. An increase in tempeture means the particles will more quicker with more energy and therefore diffusion will happen more quickly.
Increasing the surface area, will also make diffusion occur more quickly.
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