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

Diffusion is a fundamental concept in physics, chemistry, and biology, and it refers to the movement of particles from an area of higher concentration to an area of lower concentration.

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Definition:

Diffusion is the net passive movement of molecules or particles from a region where they are in higher concentration to a region of lower concentration, until equilibrium is reached.

It occurs without the need for energy input, making it a passive transport process.

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Examples of Diffusion:

1. Perfume spreading in a room – The scent molecules spread from where the perfume was sprayed to the rest of the air.

2. Oxygen entering blood in lungs – Oxygen diffuses from the alveoli (high concentration) into the blood (low concentration).

3. Sugar in water – When sugar is added to water, it slowly spreads out without stirring.

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In Biology:

Diffusion helps in:

• Gas exchange (O₂ and CO₂ in lungs and tissues)

• Transport of nutrients in cells

• Waste removal

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Key Features:

• Passive process (no energy required)

• Driven by the concentration gradient

• Continues until dynamic equilibrium is reached

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Would you like a visual diagram or the differences between diffusion and osmosis?