Here's why:
* Spacing: Gas particles have the most space between them compared to liquids and solids. They are not fixed in position like solids, and they don't interact as closely as liquids.
* Movement: Gas particles move freely and randomly, colliding with each other and the walls of their container. This constant motion is what gives gases their ability to expand to fill any volume.
* Density: Because of the large spacing, gases have much lower densities than liquids or solids.
Examples:
* Air (a mixture of gases)
* Helium
* Oxygen
* Carbon dioxide
Let me know if you'd like more information about gases!
