Diffusion Essay

1221 WordsOct 21, 20145 Pages
Diffusion is the net movement of a substance (e.g., an atom, ion or molecule) from a region of high concentration to a region of low concentration. This is also referred to as the movement of a substance down a concentration gradient. A gradient is the change in the value of a quantity (e.g., concentration, pressure, temperature) with the change in another variable (e.g., distance). For example, a change in concentration over a distance is called a concentration gradient, a change in pressure over a distance is called a pressure gradient, and a change in temperature over a distance is a called a temperature gradient. The word diffusion is derived from the Latin word, "diffundere", which means "to spread out" (if a substance is “spreading out”, it is moving from an area of high concentration to an area of low concentration). A distinguishing feature of diffusion is that it results in mixing or mass transport, without requiring bulk motion (bulk flow). Thus, diffusion should not be confused with convection, or advection, which are other transport phenomena that utilize bulk motion to move particles from one place to another. Common Examples of Diffusion » 1. You can smell perfume because it diffuses into the air and makes its way into your nose. 2. A teabag placed in a cup of hot water will diffuse into the water. 3. Placing food coloring in a liquid will diffuse the color. 4. Cigarette smoke diffuses into the air. 5. A few crystals of potassium permanganate in water will diffuse and turn the water purple. 6. Stirring some sugar into tea will help it diffuse quicker. 7. Leave a soda bottle open and the carbon dioxide bubble will diffuse and leave it flat. 8. When cooking pasta, the water diffuses into the noodles, making them bigger and moister. 9. If you water wilted plants, the water will diffuse into the plants and they will get firmer. 10. A helium balloon will

More about Diffusion Essay

Open Document