Diffusion & osmosis

Learning goal We are learning the difference between diffusion and osmosis.

diffusion the movement of particles from an area of high concentration to an area of low concentration Movement continues until they are evenly distributed.

concentration Refers to the number of molecules of a substance in a given volume.

Diffusion occurs Within a cell Across the cell membrane Outside a cell in body fluids.

Factors affecting diffusion Higher temperature  diffuse faster Smaller particles  diffuse faster Gases  diffuse faster than solids and liquids

osmosis The diffusion of water across a semi-permeable membrane. Goal is to create balance.

A semi-permeable membrane lets water and some molecules diffuse across it but keeps molecules of other substances from penetrating it.

Learning goal We are learning the difference between diffusion and osmosis.