Diffusion Overview

What is Diffusion?

• Definition: The net movement of particles from an area of higher concentration to an area of lower concentration.
• Particles move randomly and spread out over time until evenly distributed.
• Occurs in both gases and liquids (e.g., perfume in a room, food coloring in water).

Diffusion through Cell Membranes

• Cell Membranes: Partially permeable, allowing only some molecules to diffuse.
  • Small molecules like water, glucose, and amino acids can diffuse through.
  • Large molecules like proteins and starch cannot fit through the membrane.
• Passive Process: Does not require energy; driven by random particle movement.

Factors Affecting Diffusion Rate

1. Concentration Gradient

   • Difference in concentration between two areas.
   • Larger concentration gradient = higher rate of diffusion.

2. Temperature

   • Higher temperatures increase particle energy, causing faster movement.
   • Higher temperature = higher rate of diffusion.

3. Surface Area

   • Larger surface area allows more particles to diffuse simultaneously.
   • Larger surface area = higher rate of diffusion.

Conclusion

• Understanding diffusion is crucial for studying cell processes and material movement.
• These principles explain how substances move naturally and can be applied in various biological and chemical contexts.

---

• Call to Action: Share this knowledge and subscribe for more educational content.