Diffusion
- Created by: GeorgeBarton
- Created on: 06-03-16 11:32
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- Diffusion
- Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentartaion
- Diffusion happens in both liquids and gases
- This is becuase the particles in each substance (liquid + Gas) are free to move randomly
- An example would be when the smell of perfume diffuses through the air in a room
- This is when gases diffuse through each other
- An example would be when the smell of perfume diffuses through the air in a room
- This is becuase the particles in each substance (liquid + Gas) are free to move randomly
- Cell Membranes
- Only very small molecules can diffuse through cell membranes - such as things like simple sugars, water or ions
- Particles flow through the cell membrane when there is a higher concentration to where there is a lower concentration
- Big molecules such as starch and proteins cannot pass through the membrane
- Only very small molecules can diffuse through cell membranes - such as things like simple sugars, water or ions
- Rate of diffusion
- Distance: Substances diffuse quicker when they don't have very far to move
- Concentration difference: Substances will diffuse faster if there is a large difference in concentartion
- Surface area: the more surface area there is for molecules to move across, the faster they can get from one side to the other
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