Ever wondered how substances move into cells, or why, when you open the front door, you can smell your favourite food cooking in the kitchen, several rooms away? The answer is diffusion. We’ll talk about concentration gradients to explain how smells (the nice and the not so nice!) travel through the air. Here is a useful animation to help you understand the process.
Osmosis is a form of diffusion that deals specifically with water. Here is a good animation to explain what is going on. This site goes into some detail about how osmosis affects living organisms and introduces some new vocabulary – hypotonic, hypertonic and isotonic. Make sure you know what these terms mean. Can you explain the science behind what is happening in the video above?