What is diffusion?

What is diffusion?

The process of spreading solid, liquid, or gaseous substances spontaneously and uniformly in a medium is called diffusion.

Diffusion is the net passive movement of molecules or particles from regions of higher to regions of lower concentration. For diffusion to occur there must be a concentration gradient.

To define diffusion in the biological context, imagine the ions, respiratory gases, glucose, or other particles that move randomly between the crowded and the less-crowded regions (fluids), often across a semi-permeable membrane.

What is diffusion in Physics?

The movement of particles from an area of higher concentration to an area of lower concentration as driven by thermal energy is called diffusion.

The particles suspended in liquids and gases, for instance, struck each other resulting in their random constant motion. This motion due to the collisions of particles is called pedesis or the Brownian movement.

What is diffusion in Biology?

Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. This is due to the random movement of the molecules.

The difference in the concentration of a substance between two areas is called the concentration gradient. The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse.