* Gases have no fixed shape or volume. They spread out to fill whatever container they're in.
* Gas molecules are far apart. Unlike solids and liquids, the molecules in a gas are much further apart and move around freely.
* You can compress a gas. This means you can decrease its volume by applying pressure. When you push on a gas, you are forcing the molecules closer together.
Here are some examples:
* Pumping air into a bike tire: You're compressing air, forcing more molecules into the tire.
* Filling a balloon with helium: You're adding more helium molecules to the balloon, increasing the pressure inside and making the balloon expand.
* A scuba tank: Compressed air is stored in the tank, allowing divers to breathe underwater.
It's important to note: While you can compress a gas, you can't really "squash" it in the same way you can a solid. You're just changing the density of the gas by forcing the molecules closer together.
