Diffusion Flashcards

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What is diffusion?

Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration.

Particles move overall from an area where there are many of them (high concentration) to an area where there are fewer (low concentration).

Particles are always moving randomly and colliding, so over time this random motion makes them spread out.

Diffusion happens fastest in gases, slower in liquids, and is extremely slow in solids.

Gas particles are far apart and move very quickly, so they can spread out and mix faster than particles in a liquid.

In a solid, particles are fixed in place and can only vibrate, so they cannot easily move past each other to spread out.

The smell of perfume or cooking spreading across a room is an example of diffusion in a gas.

A drop of food colouring slowly spreading out in a beaker of water is an example of diffusion in a liquid.

As temperature increases, diffusion happens faster because particles have more energy and move more quickly.

The particles are evenly spread out, so the concentration is the same everywhere and there is no overall movement from place to place.