# Diffusion and Osmosis

Source: https://projectgcse.co.uk/biology/life_processes_cell_activity/diffusion_and_osmosis

> We offer many resources for students revising for their GCSEs including: GCSE revision notes and practice questions, a GCSE bookshop, GCSE help and advice and the take a break section.

#### **Diffusion**

- When particles move from an area of high concentration to an area of low concentration.
- Diffusion can occur in liquids and gasses

#### **Osmosis**

- Osmosis is a kind of diffusion which only occurs with water.
- With osmosis, there is a membrane which does not allow dissolved material to pass though it but only water (selectively permeable) Osmosis is the movement of water molecules from a weak solution to a strong solution.
- Osmosis occurs when water is taken up e.g. Plants take up water from the ground.