* Take the shape of their container: Neither a gas nor a liquid has a fixed shape. They will conform to the shape of the container they are in.

* Are considered fluids: This means they can flow and take the shape of their container.

However, they differ in how they behave with regards to volume:

* Liquids have a fixed volume: While they can change shape, they maintain a constant volume. For example, a liter of water will always be a liter of water, even if you pour it into a different container.

* Gases have a variable volume: Gases will expand to fill the entire volume of their container. If you put a small amount of gas into a large container, it will spread out to fill the entire space.

Here's a simple analogy:

* Think of a liquid as a crowd of people: They are packed together, and while they can move around, they take up a fixed amount of space.

* Think of a gas as a swarm of bees: They can fly around freely and will spread out to fill any space they are given.