Diffusion is the spreading of the particles of a gas, or of any substance in a solution, resulting in a net movement
Net movement: sum of movement of all the particles. In diffusion, the net movement is from the area of high concentration to an area of lower concentration
- Before diffusion
- The number of (green) particles decreases as you go down their concentration gradient
- After diffusion
- No concentration gradient
- Particles evenly mixed
- Particles still moving around
The greater the difference in concentration, the faster the rate of diffusion.
Many dissolved substances (such as glucose and mineral salts) and gases (such as oxygen and carbon dioxide) can cross cell membranes by diffusion
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