Grade 4Science and Technology

Properties of Matter

Solid, liquid, gas; observable properties — colour, shape, texture, smell.

📖 6 min read · 3 worked examples · 6 practice questions

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The lesson

Everything around us, everything we can see and touch, is made of matter. What exactly is matter? Matter is anything that takes up space and has weight. Around this room — your desk, your pencil, even the air you breathe — it's all matter! Let's think about some examples you know. A mango — it takes up space in your hand and has weight. Water in a river — it flows, takes the shape of its container, and also has weight. Air in a balloon — you can't see it, but it fills the balloon and pushes out. All of these are matter! We'll see how our mango, water, and air are perfect examples of each.

Everything around you, from your desk to the air you breathe, is made of matter! Let's find out how matter can be solid, liquid, or gas. Here are the three states: solids, liquids, and gases. We see them every day here in Kenya. First, solids. Solids have a fixed shape and a fixed volume. That means they don't change shape on their own. Think of a stone you find on the road—it stays the same shape no matter where you put it. Also, a piece of chalk you use in class, or a sweet mango from your tree. Can you name another solid? Liquids. Liquids do not have a fixed shape—they take the shape of the container they are in. Pour water into a cup, it becomes cup-shaped. Pour it into a bottle, it becomes bottle-shaped. Examples we use a lot: water for drinking, cooking oil for frying, and fresh milk from the market. Liquids also flow—that's why they can be poured. Finally, gases. Gases have no fixed shape or volume. They spread out to fill any space. Think about the air in a tyre—it pushes out and fills the whole tyre. Or steam rising from a pot of boiling water—it floats up and spreads everywhere. You can't see gas, but you can feel it, like when you blow air onto your hand. Let's remember: solids hold their shape, liquids take the shape of their container, and gases spread out to fill all the space. Around your home after class and find one example of each.

These are the things we can notice about objects using our senses. First, colour. We can see many colours around us — red beans, blue sky, green leaves, and even clear water which has no colour. Can you name something red you have seen? Next is shape. Objects can be round like an orange, square like a box, or have no fixed shape — think of water in a cup. It takes the shape of the container. Third is texture. How does something feel when you touch it? A stone feels rough, a plastic bottle feels smooth, cotton is soft, and a table is hard. Try feeling your desk — is it smooth or rough? Finally, smell. Some things have no smell, like water. Others have a sweet smell, like a ripe mango, or a sour smell, like lemon. Whenever you observe something, ask yourself: what colour, shape, texture, and smell does it have?

Matter is everything around us – the air we breathe, the food we eat, even the water we drink. We're going to see it all right here in Kenya. Think about what you had this morning. Maybe a warm bowl of porridge – that is a liquid. The chapati you might have eaten – that is a solid. Have you ever seen steam rising from a pot of boiling water? That is a gas! In just one meal, you've seen all three states of matter. Let's imagine we're at the market. You see piles of fresh fruits like mangoes and oranges – they are solids. There is cooking oil in a bottle – that's a liquid. At those colourful balloons – they are filled with air, which is a gas. Matter really is everywhere! Here is something to think about. At the water in River Tana – what state is that? What about the ice in a cold drink – is that a solid or a liquid? I want you to really think about these examples.

Matter is everything that has weight and takes up space. Think of the soil in your garden, the water in your cup, or even the air you cannot see — all of these are matter. We discovered that matter comes in three main states. Solids have a fixed shape, like a stone you pick up from the path. Liquids flow and take the shape of their container, like the milk your mother pours. Gases have no fixed shape and fill any space, just like the air in a balloon. We also learned how to describe matter by its observable properties — its colour, shape, texture, and smell. For example, a ripe mango is yellow, round, smooth, and sweet-smelling. These properties help us identify different kinds of matter. Remember, matter is everywhere — from the chair you sit on to the breeze you feel. Keep observing the world around you, and you will see matter in action every single day. Great job today, everyone! You were wonderful learners.

Worked examples

A Solid

This is Worked Example 1: describing a solid. At the object on the slide. It's a small stone from the roadside. Have you seen stones like this before? Maybe on your way to school? Let's describe its properties. First, its state: it is a solid. That means it has its own shape and it doesn't change. What colour is it? Grey. What about its shape? Rough and irregular – not smooth like a ball. How does it feel? Hard and rough. Does it have a smell? We used our eyes and hands to describe it. Here is a picture of the stone. At its rough edges and uneven surface. That's one way we know it's a solid – it keeps its shape. To sum up: this stone is a solid because it has its own shape, it's grey, rough, hard, and has no smell. Great job, everyone! You now know how to describe a solid using your senses.

A Liquid

Another liquid – cooking oil from a bottle. We'll describe it using state, shape, colour, texture, and smell. Think about the oil your mum uses for cooking – that's exactly what we're describing. First, the state: it's a liquid. That means it flows and takes the shape of its container. If you pour it into a round pan, it becomes round; into a square pan, it becomes square. What colour is it? It's yellow – a light yellow. How does it feel? Smooth and slippery – that's why it's easy to pour. Finally, the smell – a mild oily smell. Can you imagine that? We've described cooking oil using all five properties.

A Gas

Great job, everyone! Let's move to our third worked example. We're going to describe a gas — specifically, the air inside a balloon. Who has blown up a balloon before? You can feel the air pushing back, right? We're describing the air inside a balloon. Let's think: What state is it in? It's a gas. A gas doesn't have a fixed shape — it takes the shape of whatever container it's in, like this balloon. Here are its properties. First, colour — it's colourless. We can't see air, can we? Second, shape — it takes the shape of the balloon. If you squeeze the balloon, the air moves. Third, texture — we can't feel it directly with our hands, but we can feel it when it moves, like a breeze. Fourth, smell — it has no smell, unless someone puts perfume in the balloon! Remembering these properties helps us describe any gas.

Practice questions

  • Which is a solid? The answer is B: Stone.
  • Which property tells you how something feels? That's B: Texture.
  • Let's look around our classroom. Can you name something that is a solid?
  • We looked at a mango — a solid from our everyday life. Solids have their own shape that doesn't change unless we cut or break them.
  • In question two, we considered air. Air is a gas.
  • These two questions remind us that solids have a fixed shape, and gases like air are invisible but can be felt or smelled. Great job practicing!

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