Diffusion is a passive process where particles spread out from an area of high concentration to an area of low concentration until equilibrium is reached.
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Concentration Gradient: The difference in concentration between two areas. Particles will naturally move from an area with higher concentration to one with lower concentration through diffusion.
Passive Transport: This refers to movement across cell membranes that does not require energy, such as diffusion.
Equilibrium: A state where concentrations are equal across a system, often achieved through processes like diffusion.