What is Diffusion _ It’s Meaning and Definition Diffusion is the net passive movement.

What is Diffusion _ It’s Meaning and Definition Diffusion is the net passive movement.

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What is Diffusion? Meaning and Definition

 Definition:

Diffusion is the net passive movement of particles (atoms, ions, or molecules) from a region of higher concentration to a region of lower concentration until equilibrium is reached. This process occurs naturally without the need for external energy.

 Key Characteristics of Diffusion:

Passive Process: No energy (ATP) is required.
Moves from High to Low Concentration: Particles move down their concentration gradient.
Occurs in Gases, Liquids, and Solids: Common in biological, chemical, and physical systems.
Random Molecular Movement: Driven by kinetic energy of molecules.

 Types of Diffusion

Simple Diffusion: Direct movement of particles across a membrane without the help of proteins.
 Example: Oxygen (O₂) and Carbon dioxide (CO₂) diffusion in the lungs.

Facilitated Diffusion: Movement of larger or charged molecules via special transport proteins.
 Example: Glucose transport through cell membranes using carrier proteins.

Osmosis: A special type of diffusion where water molecules move across a semi-permeable membrane from low solute concentration to high solute concentration.
 Example: Absorption of water by plant roots.

Effusion: Diffusion of gas particles through a small hole without collisions.
 Example: Gas escaping from a balloon through a tiny hole.

 Real-Life Examples of Diffusion

Perfume spreading in a room – The scent molecules diffuse in air.
Tea bag in hot water – Tea molecules spread evenly in water.
Gas exchange in lungs – Oxygen diffuses into blood, CO₂ diffuses out.
Sugar dissolving in water – Sugar molecules diffuse until fully mixed.

 Importance of Diffusion

Biological Processes: Helps in respiration, nutrient absorption, and waste removal.
Industrial Applications: Used in food processing, medicine, and manufacturing.
Environmental Impact: Affects air and water pollution spread.

 Conclusion: Diffusion is a fundamental natural process that plays a crucial role in science, biology, chemistry, and daily life.