🧊 Solids, Liquids & Gases: The Three Amazing States of Matter
Discover the three states of matter — solids, liquids, and gases! Learn what makes each one special and how they are all around you every single day.
Learning Goals
By the end of this lesson, you will be able to:
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Identify the three states of matter: solids, liquids, and gases
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Describe how solids, liquids, and gases look and behave
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Sort everyday objects into their correct state of matter
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Explain how matter can change from one state to another
Before You Start
Before this lesson, you should know:
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You should know that everything around us is made of material we call matter
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You should be able to observe and describe objects using words like hard, wet, or soft
Here are a few things that will help you get going.
Key Words
Important words to know for this lesson:
Matter
Anything that takes up space and has weight. Everything around you is made of matter!
Solid
Matter that keeps its own shape and size, like a rock, a toy, or an ice cube.
Liquid
Matter that flows and takes the shape of its container, like water or juice.
Gas
Matter that spreads out to fill all the space it can, like the air you breathe.
State of Matter
The form that matter takes — solid, liquid, or gas.
The Three States of Matter
Everything around us is made of matter, and matter comes in three main forms called states: solids, liquids, and gases. 🌍
Solids keep their shape: A solid stays the same shape no matter where you put it. A block does not change shape if you move it from a box to a table.
Liquids take the shape of their container: A liquid flows and fills the bottom of whatever holds it. Pour juice into a tall cup or a flat bowl — it changes shape to fit!
Gases fill all the space: A gas spreads out everywhere it can. The air in a balloon fills the whole balloon, even the corners.
Tiny particles move differently: In a solid, tiny bits are packed tightly and barely move. In a liquid they slide past each other. In a gas they zoom around freely!
Matter can change state: Heating or cooling can change matter. Ice (solid) melts into water (liquid), and water can boil into steam (gas).
Example
Think about water! 💧 When it's frozen it's a solid ice cube. When it melts it's a liquid you can drink. When it boils on the stove it becomes steam, which is a gas floating into the air.
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This diagram shows how tiny particles are packed tightly in solids, slide around in liquids, and spread out freely in gases.
Let's Try It Together!
Basic
Is a rock a solid, liquid, or gas? How do you know?
Let's Try a Harder One!
Intermediate
You pour juice into a tall glass, then into a short bowl. What state is the juice, and what happens to its shape?
Your Turn to Practice
Try this one yourself — use the hint if you get stuck:
When you blow up a balloon with your breath, what state of matter fills the balloon, and how does it fill the space?
Watch Out For...
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Thinking all gases are invisible, so there is nothing there.
Gases are real matter! Air is a gas you cannot see, but it fills balloons and makes wind. 💨
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Saying sand is a liquid because it pours.
Sand pours, but each tiny grain is a solid that keeps its shape. It only looks like it flows because the grains are small.
In the Real World
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Ice cubes (solid) melt into water (liquid) in your drink on a hot day.
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When water boils in a pot, it turns into steam — a gas you can see rising!
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A balloon is filled with air, which is a gas that takes the shape of the balloon.
Quick Check
Test your understanding — tap an answer to check:
Q1.Which one keeps its own shape no matter what?
Q2.What does a liquid do when you pour it into a new cup?
Q3.Which state of matter spreads out to fill any space?
Challenge Question
Optional
Stretch your brain — this one's a bit harder!
You leave a tray of ice cubes on the kitchen table all day. When you come back, the tray has water in it, and some water has disappeared! Explain what happened to the matter using the words solid, liquid, and gas.
Key Takeaways
1.Solids keep their own shape and size, like a rock or a block.
2.Liquids take the shape of their container but keep the same amount, like water or juice.
3.Gases spread out to fill any space, like air in a balloon.
4.Heating or cooling can change matter from one state to another — ice melts to water, and water boils to steam.
Printable Cutouts
Matched to this lesson — untick anything you don't need, then print.
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Ready to Practice?
Now that you've learned Solids, Liquids & Gases, put it to the test with a quick quiz!