What do you observe when a gas jar which appears empty is inverted over a gas jar containing Bromine vapours ? Name the phenomenon.

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Solution

When a gas jar full of bromine vapours (reddish brown) is inverted over a gas jar containing air over it.
It is observed that after sometime, the reddish brown vapours of bromine also spread out into the upper jar. This mixing is called diffusion. The rate of diffusion is the fastest in gases and the slowest in solids. It increases with an increase in temperature.

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