🔬 ScienceGrade 2Lesson 17
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Review Solids, Liquids, Gases
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Learning Objectives
- 1Name the three states of matter
- 2Describe one key property of each state
- 3Give two real-life examples of a solid, a liquid, and a gas
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Mini Lesson
Look around the room. Your desk, your water bottle, the air you breathe — all of it is matter. Matter is anything that has mass and takes up space. All matter exists in one of three states: solid, liquid, or gas.
Solid
- A solid has a definite shape and size that it keeps on its own.
- Its particles are tightly packed together and don't move around freely.
- You can hold a solid — it does not pour or float away.
- Examples: a rock, a wooden block, an ice cube, a pencil, a book.
Liquid
- A liquid has a definite volume but no fixed shape — it takes the shape of whatever container it is poured into.
- Its particles can slide past each other, which is why liquids flow and pour.
- Examples: water, juice, milk, honey, cooking oil.
Gas
- A gas has no fixed shape and no fixed volume — it spreads out to fill any container completely.
- Its particles move around very fast and are far apart from each other.
- Most gases are invisible, but you can feel them (like wind) or smell them.
- Examples: the air we breathe, steam above a hot cup, helium inside a balloon.
Matter can change state
- Adding or removing heat can change matter from one state to another.
- Ice (solid) melts into water (liquid). Water boils into steam (gas). Steam cools back into water.
- The material stays the same — only its state changes.
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Ask yourself: What are the three states of matter? What is one key property that makes a solid different from a liquid?
Vocabulary
Matter
Anything that has mass and takes up spacee.g. rocks, water, air
Solid
Matter with a fixed shape and fixed size; particles are tightly packede.g. ice cube, pencil, book
Liquid
Matter with a fixed volume but no fixed shape; it takes the shape of its containere.g. water, milk, juice
Gas
Matter with no fixed shape and no fixed volume; it spreads to fill any spacee.g. air, steam, helium
Melting
When a solid is heated and changes into a liquide.g. ice turning into water
Freezing
When a liquid loses heat and changes into a solide.g. water turning into ice
Boiling
When a liquid is heated enough to change into a gase.g. water turning into steam
Condensing
When a gas cools and changes into a liquide.g. steam turning back into water droplets
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