Reverse Osmosis - GCSE Chemistry Definition

Reverse osmosis is a method used to purify water by removing dissolved substances, such as salts, dirt, and bacteria. It works by applying pressure to water, forcing it through a partially permeable membrane.

This membrane allows only water molecules to pass through, while larger particles and impurities are left behind. Reverse osmosis is commonly used in desalination (removing salt from seawater) to produce safe drinking water.

In GCSE Chemistry, reverse osmosis is studied as part of water treatment, helping students understand how filtration and separation work at the molecular level.