What are gases?

Gases are like invisible friends that can stretch and shrink to fill up any space they're in.

Imagine you have a balloon. When you blow it up, it gets bigger because air, which is a gas, goes inside. But if you let the air out, the balloon becomes small again. Gases work like that too. They move around freely and take up the shape of whatever container they're in.

Gases are made of tiny particles that are far apart from each other. These particles zoom around quickly and don’t stick together much, just like kids running around on a playground, not holding hands or forming lines.

When you heat something up, the gas inside it moves faster, making it expand, like when a hot air balloon rises. When you cool it down, the gas slows down and takes up less space, kind of like how your breath turns into visible clouds on a cold day.