* Compressibility: Air can be compressed, meaning its volume can be reduced by applying pressure. This is why we can inflate tires and balloons.

* Expandability: Air can expand to fill any container it occupies. This is why a deflated balloon expands when you blow air into it.

* Fluidity: Air can flow and take the shape of its container. This is why wind moves and why we can feel air currents.

* Low density: Air is less dense than liquids and solids, which is why we can fly kites and hot air balloons.

* Diffusion: Air molecules are constantly moving and will spread out to fill a space evenly. This is why the smell of perfume eventually spreads throughout a room.

It's important to remember that air is a mixture of gases, primarily nitrogen and oxygen. However, it still exhibits the common properties of all gases.