You dip your teabag into a cup of boiling water and watch the clear steaming liquid slowly change into an inviting rich red. The laws by which the particles of tea spread from the source of high ...

Active transport is a process that moves molecules against a concentration gradient. The process requires energy. For plants to take up mineral ions, ions are moved by active transport into root hairs ...

If a crystal of a coloured soluble chemical, eg potassium manganate(VII), is placed in water, the particles spread out and mix with the water particles. As well as diffusion occurring between ...

Modifications to existing theories have enabled researchers to better understand and model the dynamics of systems which don't obey conventional laws of diffusion. In normal circumstances, particles ...