Differences between diffusion and osmosis
| Osmesis |
Diffusion |
| 1. In this process semi-permeable membrane is used. |
1. In this process no semi-permeable membrane is used. |
| 2. It takes place from lower concentration to higher concentration. |
2. It takes place from higher concentration to lower concentration. |
| 3. It takes place only in solutions. |
3. It takes place in gases as well as in solutions. |
| 4. It can be stopped or reversed by applying pressure on the solution with higher concentration. |
4. It cannot be stopped or reversed. |
Examples:
Diffusion:
When potassium permanganate is added in container of water then after some time violet colour spreads in container. This is an example of diffusion. Representation of process of diffusion by digram:
Osmosis:
If we put grapes in a concentrated solution of NaCl, the grapes shrink but if we put kismis or grapes into pure water, they swell. It is a phenomenon of osmosis. Representation of process of osmosis by diagram:
