When an empty gas jar is inverted over a gas jar containing a coloured gas, the gas also spreads into the empty jar. Why?

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Solution

Diffusion:
As the particles of matter are in motion, the particles of one kind mix with particles of another kind through a natural movement.
The intermixing of one kind of particle with another kind is known as diffusion.
When an empty gas jar is inverted over a gas jar containing air. It is observed that after some time the coloured gas spread out into the jar.
The intermixing of coloured gas with air is known as diffusion.
The rate of diffusion is slowest in the case of solids and highest in the case of gases.

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