States of Matter Worksheet: Solid, Liquid or Gas? (Free KS2 Printable)

What Year 4 children need to know about states of matter

By the end of Year 4, children are expected to be able to group everyday materials into solids, liquids and gases. The key idea is that we sort by properties, not by what something is made of. A solid keeps its shape and does not flow; it takes up a fixed amount of space. A liquid flows and takes the shape of its container, but its surface stays level and it keeps the same volume. A gas has no fixed shape and spreads out to fill all the space available to it. Encouraging children to ask the three test questions on this sheet, namely 'Does it keep its shape?', 'Does it flow?' and 'Does it spread to fill the space?', gives them a reliable method they can apply to objects they have never met before.

Using everyday objects to teach the three states

The objects in the picture are deliberately ordinary so that the learning transfers to real life. The ice cube and the wooden block are clear solids that hold their shape. The water in the glass is a liquid that takes the shape of whatever it is poured into. The steam from the kettle and the air inside the balloon are gases, though gases are the trickiest state for children because we usually cannot see them. Talking about steam, breath on a cold day, bubbles in fizzy drinks and the air that fills a balloon helps children accept that gases are real materials even when invisible. A useful follow-up question is: 'If you open the lid, where does the steam go?' This draws out the idea that a gas spreads to fill the room.

Common misconceptions to watch for

Several misunderstandings appear again and again at this age, and gently correcting them now saves confusion later. Many children think that anything you can pour, such as sand, sugar or rice, must be a liquid; in fact these are tiny solid pieces, and each individual grain keeps its shape. Some assume that gases are not 'real' or weigh nothing, when in fact air and steam are genuine materials made of matter. Others confuse temperature with state, believing 'hot' automatically means gas. The ice cube is a helpful talking point here: it is the same substance as the water in the glass and the steam from the kettle, simply in a different state. Heating and cooling can change the state without changing what the material is.

How to get the most from this worksheet at home or in class

Begin with the colouring activity to settle children into the scene, then move to the sorting questions, asking them to explain their reasoning aloud or in writing rather than just giving a one-word answer. The word bank offers gentle support for children who need it, while more confident learners can be challenged to add their own examples to each group. To extend the lesson, hunt for objects around the room and sort them, or set up a simple, supervised demonstration of an ice cube melting and water evaporating to show how one material can move between all three states. Linking the worksheet to a practical activity helps the vocabulary stick.

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