1. Random Motion: Particles are constantly in motion, moving randomly in all directions.
2. Concentration Gradient: When there's a difference in concentration between two areas, it means there are more particles packed together in the high-concentration area compared to the low-concentration area.
3. Net Movement: Due to random motion, particles from the high-concentration area are more likely to move into the low-concentration area than vice versa. This creates a net movement of particles from high to low concentration.
4. Equilibrium: As particles move, the concentration difference decreases. Eventually, the particles become evenly distributed, and there's no net movement. This is called equilibrium.
Factors Affecting Diffusion:
* Concentration Gradient: The steeper the concentration gradient, the faster the diffusion.
* Temperature: Higher temperature means faster particle motion, leading to faster diffusion.
* Size of Particles: Smaller particles diffuse faster than larger ones.
* Medium: Diffusion is faster in gases than liquids, and slower in solids.
Examples of Diffusion:
* Perfume: When you spray perfume, the fragrance molecules diffuse through the air, spreading the smell.
* Sugar in Water: When you add sugar to water, the sugar molecules diffuse throughout the water, making it sweet.
* Oxygen in the Lungs: Oxygen from the air diffuses into the blood in the lungs, and carbon dioxide diffuses out.
In summary, diffusion is a passive process driven by the random motion of particles, leading to a net movement from areas of high concentration to areas of low concentration until equilibrium is reached.
