Chapter 8: How Things are Made
Everything around us — your school bag, the pot on the stove, the cloth you wear — is made from raw materials. In this chapter we trace where things come from and how they are made.
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Key Concepts
Raw Materials and Finished Products
A raw material is a natural substance that is used to make something. The thing that is finally made is called the finished product.
Examples:
| Raw Material | Finished Product |
|---|---|
| Cotton plant | Cotton cloth |
| Clay | Pots, bricks |
| Iron ore | Steel pots, tools |
| Wood | Furniture, paper |
| Sugarcane | Sugar, jaggery |
- 1.From Farm to Table — Sugar and Jaggery
- 2.Sugarcane is grown in fields.
- 3.It is harvested (cut) and taken to a mill.
- 4.Cane is crushed to extract juice.
- 5.Juice is boiled. Impurities are removed.
- 6.For jaggery (gur): the thick liquid is poured into moulds and cooled.
- 7.For white sugar: the liquid is further processed and crystallised.
- 1.From Cotton to Cloth
- 2.Cotton bolls are picked from cotton plants.
- 3.Seeds are removed by a machine called a cotton gin.
- 4.Fibres are cleaned and spun into thread (yarn) using a spinning wheel (charkha) or spinning machine.
- 5.Threads are woven on a loom (hand loom or power loom) to make cloth.
- 6.Cloth is dyed and stitched into garments.
- 1.Pottery — Clay to Pots
- 2.Clay is dug from the earth and cleaned.
- 3.A potter shapes clay on a potter's wheel.
- 4.The shaped pot is dried in the sun.
- 5.It is baked in a kiln (oven) at high temperature to become hard.
- 6.Pots may be painted or glazed.
- 1.Making Paper
- 2.Wood is cut into small chips.
- 3.Chips are boiled with chemicals to make a wet pulp.
- 4.Pulp is spread on a wire mesh, flattened, and dried to form sheets of paper.
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Worked Examples
Trace the journey of a cotton shirt from field to wardrobe.
- Cotton plant grows in farm → bolls picked → seeds removed → fibres spun into yarn → yarn woven into cloth → cloth dyed → stitched into shirt → sold in shop → bought and worn.
What is the difference between jaggery and refined sugar, even though both come from sugarcane?
- Both are made from sugarcane juice.
- Jaggery is made by boiling and moulding the juice with fewer steps — it retains more minerals.
- Refined sugar goes through more chemical processes to produce white crystals with pure sucrose.
A potter wants to make a water pot. List the steps she follows.
- Step 1: Collect and clean clay.
- Step 2: Place clay on wheel, shape it by hand while wheel spins.
- Step 3: Leave shaped pot to dry in sun for 1-2 days.
- Step 4: Fire the pot in a kiln to harden it.
- Step 5: Cool, then paint or sell.
Anita has a wooden chair. What was the raw material and what tools/processes were used?
- Raw material: Wood (from trees).
- Processes: Trees cut, wood sawed into planks, planks shaped, joined with nails/glue, sanded smooth, painted or polished.
Why is paper made from wood pulp and not from cloth?
- Wood is plentiful and inexpensive.
- Wood fibres (cellulose) can be separated easily by boiling with chemicals.
- Cloth fibres are already woven and would be wasted. Paper factories use wood chips or recycled paper.
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Common mistakes
- Students confuse raw material and finished product. Remember: raw material is what you START with; finished product is what you END UP with.
- Clay pots must be fired in a kiln — just drying in sun does not make them waterproof.
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Summary
Things around us start as raw materials from nature. Through various processes — crushing, spinning, weaving, moulding, firing — raw materials are turned into finished products we use daily. Understanding this helps us value both skilled workers and natural resources.