Here's why:
* Gas molecules are in constant random motion: They move around freely and collide with each other and the walls of their container.
* Large spacing between molecules: Unlike liquids and solids, gas molecules have a lot of space between them.
* High kinetic energy: Due to their constant motion, gas molecules possess high kinetic energy.
This combination of factors leads to rapid diffusion. When a gas is introduced into a new space, its molecules quickly spread out to fill the entire volume because:
* They have the freedom to move: They aren't restricted by strong intermolecular forces like liquids or solids.
* They collide frequently: These collisions cause them to spread out in all directions.
Therefore, the faster the gas molecules move (higher temperature) and the larger the space they have to move in, the faster they will diffuse.
