Year 4 - Science
Comparing and grouping solids, liquids and gases
Introduction to states of matter and changing states
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores the properties of solids, liquids, and gases, and how materials change state when heated or cooled. It covers evaporation, condensation, and the water cycle, with a focus on practical enquiries, careful observations, accurate measurements, and presenting findings.
Lesson Summary
You will learn to compare and group materials according to whether they are in solid, liquid or gas state.
Key Notes
- Solids, liquids and gases have different properties
- We can observe and classify materials as solid, liquid or gas state
- Some objects are made from different materials, so can have properties of more than one state
- Some materials are difficult to classify because they appear to have properties of both solids and liquids
Vocabulary To Learn
- solid: A solid has a fixed shape and volume but some solids can change shape when a force is applied.
- liquid: A liquid can flow, has a fixed volume and takes the shape of the bottom its container
- gas: A gas can flow, has no fixed volume and takes the shape of the whole of its container
- classify: To classify is to sort objects into groups
- Venn diagram: A Venn diagram is a way of displaying how you group items. It is made up of overlapping circles
Common Mistakes To Avoid
- Some solids can be poured and take the shape of their containers and therefore are liquids. A material is not the same material after it has been crushed.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Solids, liquids and gases have different properties. We can observe and classify materials as solid, liquid or gas state.
2. Define this scientific word and use it in context. 'solid'
A solid has a fixed shape and volume but some solids can change shape when a force is applied. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Some solids can be poured and take the shape of their containers and therefore are liquids. A material is not the same material after it has been crushed. Correction: Teaching slides and investigation will help children consider the difference between one solid particle of a material and a pile of particles which behaves together like a liquid.
More Lessons In This Unit
- Changing state: gas to liquid Study Guide
- Changing state: liquid to gas Study Guide
- Changing state: liquid to solid Study Guide
- Changing state: solid to liquid Study Guide
- Evaporation and condensation in the water cycle Study Guide
- Everyday examples of changing state: solids and liquids (non-statutory) Study Guide
- Everyday examples of evaporation and condensation (non-statutory) Study Guide
- Melting ice caps and glaciers (non statutory - Climate Change & Sustainability) Study Guide
- Melting temperatures: do and review Study Guide
- Melting temperatures: plan Study Guide
- Melting temperatures: research Study Guide
- Properties of solids, liquids and gases Study Guide
- Temperature and evaporation: do and review Study Guide
- Temperature and evaporation: plan Study Guide
- Thermometers and data loggers Study Guide
Browse all guides in the Year 4 Science guide library.