Here's why:
* Low density: Gases have very low densities compared to liquids and solids. This means their particles are spread out and have lots of empty space between them.
* High compressibility: Gases can be easily compressed because there is a lot of free space between particles. The particles can be squeezed closer together.
* Constant random motion: Gas particles are constantly moving in random directions, colliding with each other and the walls of their container. This movement contributes to the space between particles.
In contrast:
* Liquids have particles that are closer together than gas particles, but they can still move around and slide past each other.
* Solids have particles that are packed tightly together and are fixed in a rigid structure.
