Liquids are one of the states of matter, along with solids, gases and plasma. In a liquid, the particles are close together but can move around, which is why liquids can flow and take the shape of their container. Unlike gases, liquids have a fixed volume, meaning they don't expand to fill a space, but they can still be poured or spread out. Water, juice, and oil are all common examples of liquids. If a liquid gets cold enough, it can freeze into a solid, like how water turns into ice. If it gets hot enough, it can turn into a gas, like when water boils and becomes steam.