Diffusion

Diffusion

1. Dissolved substances have to pass through the cell membrane to get into or out of a cell. Diffusion is one of the processes that allows this to happen

2. Diffusion occurs when particles spread

   • They move from a region where they are in high concentration to a region where they are in low concentration
     • This is true in gases and for particles dissolved in solutions

3. Diffusion happens when the particles are free to move

4. Particles diffuse down a concentration gradient, from an area of high concentration to an area of low concentration

5. EG. This is how the smell of cooking travels around the house from the kitchen