Class 6 : Science – ( English ) : Lesson 6. Materials Around Us

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On December 12, 2025

EXPLANATION AND ANALYSIS

🌍 Introduction: Why Do We Study Materials Around Us?
Everything we see, touch, use, or depend on in daily life is made of some material. From the clothes we wear, the utensils we use, the houses we live in, to the toys children play with—each object is made from one or more materials. Understanding materials helps us choose the right material for the right purpose, use resources wisely, and appreciate how science is connected to everyday life.
🧠 This lesson helps us observe our surroundings carefully and classify materials based on their properties, rather than just their appearance.

🧱 What Are Materials?
A material is the substance from which an object is made.
For example:
🔵 A chair may be made of wood, plastic, or metal
🔴 A bottle may be made of glass or plastic
🟢 A shirt may be made of cotton, wool, or synthetic fibre
Although objects may look different, many of them can be made from the same material, and one material can be used to make many different objects.
📌 This shows that materials are more fundamental than objects.

🔍 Need for Classification of Materials
There are countless materials around us. Studying each one separately would be confusing. So, scientists classify materials into groups based on similar properties.
🧠 Classification helps us:
🟣 Understand materials better
🟢 Predict their behaviour
🔵 Choose suitable materials for specific uses
🟠 Reduce confusion while studying science

🪵 Classification Based on Appearance
Some materials look shiny, while others do not.
✨ Lustrous materials
These materials have shine on their surface.
Examples:
🟡 Gold
🟠 Silver
⚙️ Aluminium
🌫️ Non-lustrous materials
These materials do not shine.
Examples:
🟤 Wood
🧱 Stone
🟫 Rubber
📌 Lustre is often associated with metals, but not all shiny objects are metals.

🧲 Classification Based on Hardness
Materials can be hard or soft.
🟥 Hard materials
They are difficult to scratch or compress.
Examples:
🧱 Stone
🔩 Iron
🟦 Soft materials
They can be easily scratched, bent, or pressed.
Examples:
🧽 Sponge
🧶 Cotton
⚠️ Hardness depends on comparison. A material may be hard compared to one object but soft compared to another.

💧 Materials Based on Solubility in Water
Some materials dissolve in water, while others do not.
🟢 Soluble materials
They dissolve completely in water.
Examples:
🧂 Salt
🍬 Sugar
🔴 Insoluble materials
They do not dissolve in water.
Examples:
🪨 Sand
🛢️ Oil
🧠 Solubility helps us in cooking, medicine, and cleaning processes.

🌊 Floating and Sinking in Water
When materials are put in water, some float while others sink.
🟦 Materials that float
Examples:
🪵 Wood
🧴 Plastic bottle
🟥 Materials that sink
Examples:
🪙 Coin
🪨 Stone
📌 Floating and sinking depend on density, not just weight.

🔥 Materials Based on Transparency
Based on how they allow light to pass through, materials are classified as:
🟢 Transparent materials
Light passes through them clearly.
Examples:
🪟 Glass
💧 Clean water
🟡 Translucent materials
Allow some light to pass through.
Examples:
📄 Butter paper
🧊 Frosted glass
🔴 Opaque materials
Do not allow light to pass through.
Examples:
🚪 Wood
📕 Book
🧠 This property is important in making windows, curtains, and lampshades.

🧪 Materials Based on Conductivity
Some materials allow heat or electricity to pass through them.
⚡ Good conductors
Examples:
🔌 Copper
🔩 Aluminium
❄️ Poor conductors (Insulators)
Examples:
🪵 Wood
🧤 Plastic
📌 That is why electric wires are metal inside but covered with plastic.

🧺 Materials Used in Daily Life
Different materials are chosen based on their properties.
👕 Clothes → Cotton, wool (soft, absorbent)
🍳 Utensils → Steel, aluminium (strong, heat conductor)
🏠 Houses → Bricks, cement (hard, durable)
🧠 Choosing the correct material makes objects safe, useful, and long-lasting.

🌱 Natural and Man-made Materials
Materials are also classified by their source.
🌿 Natural materials
Obtained from plants, animals, or earth.
Examples:
🧵 Cotton
🪵 Wood
🧱 Clay
🏭 Man-made materials
Prepared by humans using technology.
Examples:
🧴 Plastic
🧪 Nylon
🧱 Cement
📌 Man-made materials help meet modern needs, but must be used responsibly.

♻️ Importance of Responsible Use of Materials
Overuse and wastage of materials harm the environment.
⚠️ Problems caused:
🌍 Pollution
🌳 Deforestation
🦋 Loss of biodiversity
🧠 Using materials wisely, recycling, and reducing waste helps protect nature.

⭐ Importance of This Lesson
This lesson trains students to:
🔵 Observe carefully
🟢 Compare properties
🟣 Think logically
🟠 Apply science to daily life
It builds a strong base for future topics like chemistry, environmental science, and material science.

📝 Summary of the Lesson
📘 Materials are substances from which objects are made. Different materials have different properties such as appearance, hardness, solubility, transparency, and conductivity. Materials can be classified into groups to make their study easier and more meaningful. Some materials are natural, while others are man-made. The choice of material depends on its properties and the purpose for which it is used. Understanding materials helps us make better decisions in daily life and encourages responsible use of resources.

⚡ Quick Recap
🔵 Objects are made from materials
🟢 Materials have different properties
🟣 Classification makes study easier
🟠 Materials can be natural or man-made
🔴 Proper choice of material is important
🟡 Responsible use protects the environment

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TEXTBOOK AND QUESTIONS

Question 1. Unscramble the letters (Column I) and match with their properties (Column II).
Answer:
🔵 TREMAT → MATTER → 🟢 Occupies space and has mass
🔵 ULSBELO → SOLUBLE → 🟢 Mixes completely in water
🔵 TNERPASNART → TRANSPARENT → 🟢 Objects can be seen clearly through it
🔵 ERUSTL → LUSTRE → 🟢 Shiny surface

Question 2. The containers which are used to store materials in shops and at home are usually transparent. Give your reasons for this.
Answer:
📌 Transparent containers allow us to see the contents clearly without opening them.
📌 This helps in easy identification, checking quantity, and avoiding wastage.
📌 They also make handling and selection convenient in shops and homes.

Question 3. State whether the statements given below are True (T) or False (F). Correct the false statement(s).
Answer:
🔵 (i) Wood is translucent while glass is opaque. → False
✔️ Correct statement: Wood is opaque while glass is transparent.
🔵 (ii) Aluminium foil has lustre while an eraser does not. → True
🔵 (iii) Sugar dissolves in water whereas sawdust does not. → True
🔵 (iv) An apple is a matter because it occupies no space and has mass. → False
✔️ Correct statement: An apple is matter because it occupies space and has mass.

Question 4. We see chairs made up of various materials, such as wood, iron, plastic, bamboo, cement and stones. Following are some desirable properties of materials which can be used to make chairs. Which materials used to make chairs fulfil these properties the most?
(i) Hardness
(ii) Lightweight
(iii) Does not feel very cold during winters
(iv) Can be cleaned regularly and made to look new even after long use
Answer:
📌 (i) Hardness → 🟢 Wood, Iron
📌 (ii) Lightweight → 🟢 Plastic, Bamboo
📌 (iii) Not cold in winters → 🟢 Wood, Plastic
📌 (iv) Easy to clean and durable → 🟢 Plastic, Iron

Question 5. You need to have containers for collection of:
(i) food waste, (ii) broken glass and (iii) wastepaper.
Which materials will you choose for containers of these types of waste?
What properties of materials do you need to think of?
Answer:
📌 Food waste → 🟢 Plastic container
Properties: Lightweight, waterproof, easy to clean
📌 Broken glass → 🟢 Thick plastic or metal container
Properties: Hard, strong, does not break easily
📌 Wastepaper → 🟢 Cardboard or plastic container
Properties: Lightweight, easy to carry
🧠 Properties considered: hardness, strength, safety, ease of handling, and durability.

Question 6. Air is all around us but does not hinder us from seeing each other. Whereas, if a wooden door comes in between, we cannot see each other. It is because air is and the wooden door is . Choose the most appropriate option.
Answer:
✔️ Correct option: (i) transparent, opaque

Question 7. Imagine you have two mysterious materials X and Y.
Material X is rigid and does not change shape easily.
Material Y easily changes shape when pressed.
When mixed in water, only X dissolves completely.
What can materials X and Y be?
Identify whether X is hard or soft. What about Y? Justify your answer.
Answer:
📌 Material X → 🟢 Salt or Sugar
Dissolves in water
Hard because it does not change shape easily
📌 Material Y → 🟢 Clay or Sponge
Does not dissolve in water
Soft because it changes shape easily when pressed

Question 8. (i) Who am I? Identify me on the basis of the given properties.
(a) I have lustre.
(b) I can be easily compressed.
(c) I am hard and soluble in water.
(d) You cannot see clearly through me.
(e) I have mass and volume but you cannot see me.
Answer:
🔵 (a) Metal (e.g., gold, aluminium)
🔵 (b) Sponge / Cotton
🔵 (c) Salt
🔵 (d) Opaque material (e.g., wood)
🔵 (e) Air

Question 8. (ii) Make your own “Who am I?”
Answer:
🧠 I am soft, flexible, waterproof, and used to make bags.
✔️ Plastic

Question 9. You are provided with the following materials—vinegar, honey, mustard oil, water, glucose and wheat flour.
Make any two pairs of materials where one material is soluble in the other.
Now make two pairs where one material remains insoluble in the other.
Answer:
🟢 Soluble pairs:
Glucose + Water
Honey + Water
🔴 Insoluble pairs:
Mustard oil + Water
Wheat flour + Water

ADVANCE KNOWLEDGE

🧭 Seeing Materials Beyond Objects
When we look around, we usually notice objects—a chair, a bottle, a window, a shirt. But science asks a deeper question: What are these objects made of? The answer leads us to materials. Materials are not just substances; they are the reason why objects behave the way they do. The strength of a bridge, the transparency of a window, the softness of a pillow, and the safety of an electric wire all depend on the properties of materials chosen.
Understanding materials at an advanced level helps us move from simple observation to scientific reasoning. Instead of saying “this works,” we begin to ask why it works.

🧪 Properties as the Identity Card of Materials
Every material has a unique set of properties that act like its identity card. These properties decide where and how a material can be used.
🧠 Some important properties include:
hardness
lustre
transparency
solubility
conductivity
compressibility
strength
No single material has all properties. This is why nature and human innovation provide us with many different materials, each suitable for specific purposes.

✨ Lustre and Appearance: More Than Just Shine
Lustre means shine. Metals like gold, silver, copper, and aluminium appear shiny because they reflect light well. This property is not just decorative.
🔍 Why lustre matters:
shiny metals are easy to clean
they resist corrosion better
they are visible even in low light
That is why cooking utensils 🍳, jewellery 💍, and electrical components often use lustrous materials. Non-lustrous materials like wood or rubber are equally important but chosen for different reasons such as insulation or comfort.

🧱 Hardness and Strength: Standing Against Force
Hardness tells us how difficult it is to scratch or press a material. Strength tells us how much load it can bear without breaking.
🧠 Examples:
🪨 Stone and iron are hard and strong
🧽 Sponge and cotton are soft and weak
Bridges 🛤️, buildings 🏗️, and tools 🔧 require strong materials. Soft materials, on the other hand, are used where comfort, flexibility, or safety is needed—like cushions, mattresses, or packaging.

💧 Solubility: Mixing at the Molecular Level
When a material dissolves in water, it does not disappear. Its particles spread evenly at the microscopic level.
🧪 Soluble materials:
salt
sugar
glucose
🧪 Insoluble materials:
sand
chalk powder
oil
Solubility plays a major role in:
cooking 🍲
medicines 💊
cleaning agents 🧼
chemical reactions
Advanced science studies solubility to design syrups, intravenous fluids, and even water purification systems.

🌊 Floating and Sinking: The Science of Density
Some materials float, others sink. This behavior is controlled by density, not size or weight alone.
🧠 Key idea:
If an object is less dense than water → it floats
If more dense than water → it sinks
That is why:
🪵 wood floats
🪙 a small coin sinks
This principle is used in designing ships 🚢, submarines 🤿, and life jackets 🦺.

🪟 Transparency: Controlling Light
Materials interact with light in different ways.
🔵 Transparent → allow light to pass clearly (glass, clean water)
🟡 Translucent → allow partial light (butter paper, frosted glass)
🔴 Opaque → block light completely (wood, metal)
🧠 Transparency is critical in:
windows and windshields
spectacles 👓
microscopes 🔬
solar panels ☀️
Choosing the wrong level of transparency can affect safety and efficiency.

⚡ Conductors and Insulators: Directing Energy Safely
Some materials allow electricity or heat to pass through easily, while others block it.
🔌 Conductors:
copper
aluminium
🧤 Insulators:
rubber
plastic
wood
Electric wires are a perfect example of intelligent material selection: metal inside to carry current, plastic outside to prevent shock ⚠️. This combination saves lives.

🌿 Natural vs Man-Made Materials: Balance and Responsibility
Materials come from two main sources.
🌱 Natural materials:
cotton
wool
wood
clay
🏭 Man-made materials:
plastic
nylon
polyester
cement
Man-made materials solve many problems but can also harm the environment 🌍 if misused. Plastic pollution, for example, is a major global issue. Advanced understanding of materials teaches us responsible use, recycling ♻️, and sustainable choices.

🧠 Materials and Human Innovation
Human progress is closely linked to materials.
📜 Stone Age → stone tools
⚔️ Iron Age → iron weapons and farming tools
⚙️ Modern age → alloys, plastics, composites
Every major leap in civilisation happened because humans learned to understand and improve materials. Even today, scientists develop smart materials that can change shape, conduct electricity efficiently, or biodegrade safely.

⚠️ Common Misconceptions About Materials
❌ Shiny means strong
✅ Shine does not always indicate strength
❌ Heavy objects always sink
✅ Density matters, not weight
❌ All plastics are bad
✅ Responsible use and recycling matter
Clearing misconceptions is essential for scientific thinking.

🌍 Materials and Environmental Impact
Every material leaves an environmental footprint.
🧠 Overuse leads to:
pollution
resource depletion
climate impact
Advanced science focuses on:
biodegradable materials
recycling techniques
eco-friendly alternatives
Understanding materials helps future citizens make ethical and sustainable decisions.

⭐ Why This Lesson Is Scientifically Powerful
This lesson trains students to:
observe carefully 👀
compare logically 🧠
reason scientifically 🔬
apply knowledge to real life 🏠
It is not just about naming properties; it is about thinking like a scientist.

📝 Summary of the Lesson (Advanced View)
Materials are the substances from which all objects are made, and their properties determine their uses. Characteristics such as hardness, lustre, solubility, transparency, conductivity, and density help scientists and engineers select suitable materials for specific purposes. Materials may be natural or man-made, each with benefits and limitations. Understanding materials also highlights environmental responsibility, sustainability, and technological progress. This lesson builds a strong foundation for chemistry, physics, engineering, and informed daily decision-making.

⚡ Quick Recap (Advanced Points)
⭐ Materials decide object behavior
⭐ Properties guide material selection
⭐ Density explains floating and sinking
⭐ Conductors and insulators ensure safety
⭐ Natural and man-made materials must be balanced
⭐ Responsible use protects the environment
⭐ Studying materials builds scientific thinking.

Important Notice : The lessons and study materials up to July–August 2025 have been sent. Soon, after receiving feedback from teachers and students, we will deliver the latest and more innovative study materials for the upcoming months.

Important Notice : The lessons and study materials up to July–August 2025 have been sent. Soon, after receiving feedback from teachers and students, we will deliver the latest and more innovative study materials for the upcoming months.

Class 6 : Science – ( English ) : Lesson 6. Materials Around Us

EXPLANATION AND ANALYSIS

TEXTBOOK AND QUESTIONS

OTHER IMPORTANT QUESTIONS

ADVANCE KNOWLEDGE

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