Question

When a gas jar containing air is inverted over a gas jar containing, the red brown bromine vapour diffuse into air explain

Answer 1

Br is in gaseous state and gases have property to flow randomly in each direction with out any restrictions
So Br particles move and diffuse to the next jar

Answer 2

Molecules of a gas has high kinetic energy and therefore, they tend to move rapidly from one place to another. Hence, gases has the ability to diffuse at a faster rate. As a result, bromine vapors diffuse into air due to their high kinetic energy.