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Types of diffusion

Diffusion occurs in various states of matter.

Gas in gas/vacuum diffusion:

A gas released in a container diffuses and fills the container.

When the plate separating the bromine gas and air is removed, the gases diffuse until they are evenly distributed between the two gas jars.
When the plate separating the bromine gas and air is removed, the gases diffuse until they are evenly distributed between the two gas jars.

Liquid in liquid diffusion:

When two liquids that are miscible (i.e. they can be mixed) are introduced into a container and left untouched, diffusion occurs until the mixture is uniform.

Solid in liquid diffusion:

Diffusion of cocoa powder (represented by brown circles) in hot water to give a brown mixture.
Diffusion of cocoa powder (represented by brown circles) in hot water to give a brown mixture.

The particles of a solid that dissolve in a liquid similarly spread throughout the volume of the liquid.