Here's why:
* Gas molecules have high kinetic energy: They are constantly moving and colliding with each other.
* Weak intermolecular forces: Gases have very weak forces of attraction between their molecules.
* Large spaces between molecules: The molecules in a gas are far apart, leaving plenty of empty space.
These factors allow gas molecules to easily move and intermingle with other gas molecules or even molecules of a different substance, like a liquid or a solid. This process of spreading out and mixing is called diffusion.
Example: If you open a bottle of perfume in a room, you will eventually smell it throughout the entire room. This is because the perfume molecules diffuse through the air, spreading out until they are evenly distributed.
