Question

How do two gases get mixed?

Answer 1

Mixing of Two Gases :

1. We know that air is colorless and is a mixture of gases.
2. An empty gas jar is filled with air. As the air is colorless we cannot see the air in the gas jar.
3. Let us consider, a glass jar 2 containing air, placed inverted on another glass jar 1 containing bromine gas( a reddish brown gas).
4. The bromine gas being heavier than air gets spread from the lower gas jar into the upper gas jar containing air and makes both the gas jars completely filled with a reddish-brown color.
5. This is because the moving particles of bromine gas and air collide with each other and spread in all directions getting uniformly mixed.
6. Though bromine gas is heavier than air, it moves up and mixes with the air in the upper jar because its particles are moving at high speed, having sufficient kinetic energy to overcome the force of gravity. Similarly, the air also diffuses downwards into bromine gas in the lower glass jar but we cannot observe it since air is colorless.

The figure of the diffusion of the bromine gas into the air:

Conclusion:

The following points of nature of matter with respect to the process of diffusion :

1. The particles of matter are constantly moving.
2. The matter is made up of tiny particles.