Diffusion
In this picture, diffusion is demonstrated by the movement of molecules from an area of higher concentration to and area of lower concentration. Diffusion caused the net movement of the molecules to the area of lower concentration. This results from the movement of particles bouncing around in a natural motion, which causes molecules to collide and scatter. At equilibrium, particles move in both directions so that there is no net change and the molecule will be on either concentration (high or low). The concentration gradient settles, and molecules diffuse down from a region of higher concentration to an area of lower concentration.
Diffusion is the movement of molecules in a fluid or gas from a region of higher concentration to an area of lower concentration. It results from the natural motion of particles, which causes molecules to collide and scatter. Concentration is the number of molecules of a substance in a given volume, and it can vary from one region to another. Molecules diffuse down their concentration gradient, that is, from a region of higher concentration to a region of lower concentration. Some examples of diffusion are gas exchange for respiration, or gas exchange for photosynthesis. A substance tends to move from high areas of concentration to low areas of concentration until its concentration becomes equal throughout space. Over time the net movement of molecules will be out of the more concentrated area into the less concentrated one, until the concentrations become equal, at the point molecules moving to either side is equally likely. No work is performed for this to happen. Diffusion is a spontaneous process, and is also passive transport. The molecules move because the area of higher concentration is too crowded and particles heat up. So they move to an area of lower concentration to evenly spread out with little to no work performed, as a part of passive transport. Diffusion happens through the hydrophilic bilayer. When the molecule pass through to get to the lower concentration.