Rate of diffusion

thi si about the diffusion... this is science.. ;)

1. Chemistry Activity, research work…

2. This presentation is on increasing order of rate of diffusion of various substance

3. What is diffusion? Movement of a fluid from an area of higher concentration to an area of lower concentration. Diffusion is a result of the kinetic properties of particles of matter. The particles will mix until they are evenly distributed .   Eg : H 2 S(g ) in a test tube will slowly diffuse into the air of a lab until equilibrium is reached.

4. Rate of diffusion in solid, liquid and gas   Diffusion takes place very rapidly in case of gases, to a lesser extent in case of liquids, and not at all in the case of solids. However, diffusion in liquids  does  take place, albeit at a very slow rate. Solid particles Liquid particles Gas particles

5. Factors influencing rate of diffusion  Temperature: As temperature increases, the kinetic energy of the particles increases. Thus, the speed of particles also increases, which in turn increases the rate of diffusion.  Size of the particle : As the size of particle increases, rate of diffusion decreases. This is because the particles become less mobile in the solvent.  Mass of the particle: As the mass of the particle increases, the rate of diffusion decreases; as the particle becomes less mobile.

6. Examples of diffusion from our daily life… Cologne or perfume permeating the air in a room. Burning of agarbatti (coil). Spraying of perfume Burning of agarbatti (coil).

7. Boiling of milk. Smell of a food. Fragrance of a flower. Fragrance of a flower.

8. Thanks Prepared by Masudha meher IX-C