Understand Osmosis as a Special Type of Diffusion

Osmosis is a special form of diffusion.

Diffusion is the general movement of particles from a high to lower concentration.

Osmosis refers to the diffusion of water only, across a membrane.

Osmosis is the diffusion of water molecules, from a region where they are in higher concentration such as a dilute solution or pure water, to a region where they are in lower concentration such as a concentrated solution. 

This movement of water via osmosis, happens across living cells, in the human body and in plants. 

Let's try a few questions about osmosis and diffusion.