difuusioon
Difuusioon (diffusion) is the net movement of particles from regions of higher concentration to regions of lower concentration, driven by random thermal motion. It occurs in gases, liquids, and solids and does not require external energy. The process tends to equalize concentration differences over time and is a fundamental transport mechanism in chemistry, physics, and biology.
Diffusion arises from the random motion of molecules, which creates a net flux down a concentration gradient.
Diffusion types include simple diffusion, and facilitated diffusion across biological membranes, which uses proteins but does
Applications span gas exchange in respiration, nutrient transport in organisms, drug delivery, pollution dispersion in air