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Definition of Diffusion:
Diffusion is the net movement of particles (molecules or ions) from a region of their higher concentration to a region of their lower concentration.
Figure 1 Dye particles in a drop of dye in water will diffuse until they are of the same concentration to form a uniform solution.
Key Characteristics of Diffusion
Diffusion does not require energy. Energy is obtained from kinetic energy of the particles.
Process occurs in both living and non-living systems.
Process will occur when there is a difference in concentration between two regions (ie a concentration gradient is present).
Process continues until the particles are uniformly distributed throughout the container.
Process may or may not require a partially permeable membrane.
Watch the following video to find out the factors that affect the rate of diffusion. Click here.
Key Characteristics of Diffusion
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