Year 4 - Science
Changing state: liquid to gas
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 observe water change from the liquid state to the gas state.
Key Notes
- Water in the liquid state can change into water in the gas state (water vapour).
- In its gas state, water is invisible, can flow, has no fixed volume and takes the shape of the whole of its container.
- The process in which a liquid changes to a gas is called evaporation.
- Water can be observed changing from liquid to gas.
- We can change the state of a liquid to a gas by heating.
Vocabulary To Learn
- liquid: A liquid can flow, has a fixed volume and takes the shape of the bottom its container.
- state: Materials can exist in three common states of matter: solid, liquid and gas.
- gas: A gas can flow, has no fixed volume and takes the shape of the whole of its container.
- water vapour: Water is called water vapour when it is in the gas state.
- evaporation: Evaporation is the change of state from a liquid to a gas.
Common Mistakes To Avoid
- Water cannot exist in a gas form.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Water in the liquid state can change into water in the gas state (water vapour). In its gas state, water is invisible, can flow, has no fixed volume and takes the shape of the whole of its container.
2. Define this scientific word and use it in context. 'liquid'
A liquid can flow, has a fixed volume and takes the shape of the bottom its container. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Water cannot exist in a gas form. Correction: Teaching slides explain that water can exist as gaseous water vapour and the process of evaporation.
More Lessons In This Unit
- Changing state: gas to liquid Study Guide
- Changing state: liquid to solid Study Guide
- Changing state: solid to liquid Study Guide
- Comparing and grouping solids, liquids and gases 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.