Diffusion is the passive movement of molecules from one area to another area, without the need for energy. When molecules move because of diffusion, we say that they diffuse. This movement is always from an area of high concentration (where there is a lot of that molecule) to an area of low concentration (where these is not a lot of that molecule) until the molecule is evenly distributed throughout the area. This idea of diffusion explains the movement of all types of things based on concentration within a material or solution, or even within your own body. This is same concept that explains why the powder drink mix will eventually spread through the entire glass of water. If you’d be willing to give it enough time to do so.
There are a lot of factors that affect how quickly diffusion will take place. One is the issue of concentration, the other is how easy will the materials move in a solution. The idea of ease of movement is related to temperature. In this lab, we will look at how these two concepts impact the rate of movement (or how easy) for a food dye to diffuse through a cup holding water of different temperatures.