Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?

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Solution

When bromine diffuses in the air, the bromine particles bump into the already present air particles due to which diffusion is slow but in vaccum, there are no air particles in the way of bromine particles, therefore bromine particles can diffuse fast.

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Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so ?

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