States of Matter
Matter exists mainly as solid, liquid or gas, each with its own particle arrangement and movement.
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Matter exists mainly as solid, liquid or gas, each with its own particle arrangement and movement.
- Solids have a fixed shape and volume
- Liquids take the shape of their container
- Gases fill all the space available
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is States of Matter?
Within Chemistry, which covers atoms, bonding, reactions, the periodic table, organic chemistry and the chemistry of everyday life, this topic explains States of Matter. Chemistry links what you can see in the lab to the particles and bonds behind it, so each topic here shows that link in a model.
Check that you can explain States of Matter in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding States of Matter helps you explain why substances behave as they do, from cleaning products and food to medicines.
States of Matter in detail
The three main states of matter are solid, liquid and gas. In a solid, particles are packed closely in a regular pattern and vibrate about fixed positions, so solids have a fixed shape and volume. In a liquid, particles are close but can slide past each other, so liquids flow and take the shape of their container.
In a gas, particles are far apart and move quickly in random directions, so gases spread out to fill any container and can be compressed. The state a substance is in depends on temperature and pressure and on the strength of the forces between its particles.
How the interactive helps you understand States of Matter
Watch the gas particle model in the interactive. Use any sliders or buttons it offers to change the values and see how the gas particle model responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of States of Matter.
Real-life uses and examples
- Use States of Matter to explain what happens in a lab experiment and why.
- Link States of Matter to everyday products such as cleaning agents, food and medicines.
- Read a chemical equation or diagram and work out what States of Matter shows.
Common mistakes to avoid
- Describing what happens without explaining the particles or bonds involved.
- Mixing up the names of substances or ions when you describe States of Matter.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about States of Matter
What is States of Matter?
Matter exists mainly as solid, liquid or gas, each with its own particle arrangement and movement.
What are the most important points about States of Matter?
The main points are: Solids have a fixed shape and volume; Liquids take the shape of their container; Gases fill all the space available.
Why is States of Matter useful?
Understanding States of Matter helps you explain why substances behave as they do, from cleaning products and food to medicines.
How can I practise States of Matter?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to States of Matter?
Related topics in Chemistry include Diffusion, Electron Configuration, The Periodic Table.