Question

What do you call the ability of a gas to completely spread out and mix with other substances?

Answer 1

The ability for gas to mix with other substances is diffusion.

Answer 2

Explanation:

When a gas is able to spread out and mix completely with other substances then this property of gases is known as diffusion.

It is known that molecules of a gas are held together by weak Vander waal forces hence, they move rapidly from one place to another and easily spread into the atmosphere.

Also, molecules of a gas spread randomly and does not follow any particular order to move.