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Diffusion is the name of process that , happens in liquids and solids ( Atomic diffusion ) as well although in solids it is a very slow process.ln liquids it is quicker, imagine putting a drop of dye into a bowl of clear water, after a while all the water will be colored.
Brown fumes of bromine vapour spread through the whole glass jar because of phenomenon of diffusion in the glass jar.
The gasses gases show the property of moving continuously in the air that's why Brown fumes of bromine vapour spread through the glass jar.
Check link for reference
https://edu.rsc.org/download?ac=12149
