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Tamil Nadu (TNBSE)Class 4 Science★ 4-5 marks in TN Class 4 Term 1 exams — household gadgets, kitchen science, and safety awareness

Science in Everyday Life

Samacheer Kalvi (TN State Board) Class 4 Science — Chapter 4, Science in Everyday Life. Simple machines and household tools. Study notes, key concepts, worked examples, practice questions and quick revision for exam preparation.

⏱ 12 min readEasy difficulty✓ Free · NCERT-aligned

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By the end of this chapter you'll be able to…

1Explain the working principle of a pressure cooker: sealed vessel → steam trapped → pressure increases → water boils above 100°C → faster cooking
2Explain the thermos flask: double-walled glass with vacuum between walls → prevents heat transfer by conduction and convection → keeps hot things hot and cold things cold
3Explain that a refrigerator removes heat from inside; it does not create cold
4List basic first aid steps: for minor cuts (wash with clean water, apply antiseptic, cover with bandage), for minor burns (hold under cool running water for 10 min, do NOT apply butter/oil/toothpaste), for insect bites (wash, apply cold compress, do not scratch)

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Why this chapter matters

Science in Everyday Life for Class 4 goes beyond kitchen basics to understanding how common household appliances work. Children learn the science behind the pressure cooker (high pressure = high boiling point = faster cooking), the thermos flask (vacuum prevents heat transfer), and the refrigerator (removes heat, does NOT 'create' cold). This chapter also introduces the concept of first aid — what to do for minor cuts, burns, and insect bites — which can genuinely help a child respond correctly in an emergency rather than panicking.

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Science in Everyday Life — Class 4 Science (Samacheer Kalvi)

TN State Board (Samacheer Kalvi) Class 4 Science, Chapter 4. Simple machines and household tools.

1. About this chapter

This chapter covers Science in Everyday Life as part of the Class 4 Samacheer Kalvi Science curriculum. It deals with simple machines and household tools and builds conceptual understanding essential for the TN School Term Exam.

By the end of this chapter, students will be able to:

Identify simple machines in daily life
Explain how tools make tasks easier

2. Key concepts

Concept 1: Identify simple machines in daily life.
Concept 2: Explain how tools make tasks easier.

3. Important terms and formulas

Term / Formula	Description
Identify simple machines in…	Identify simple machines in daily life
Explain how tools make…	Explain how tools make tasks easier

4. Worked examples

Example 1. Applying a key concept from this chapter.

Solution: Identify the relevant principle → apply the formula or rule → state the answer with correct units.

Example 2. A typical exam-style question on science in everyday life.

Solution: Break the problem into steps, use the appropriate formula and verify the answer.

5. Common mistakes

Mistake: Skipping units or forgetting to state them. Fix: Always write units alongside every quantity and answer.
Mistake: Confusing similar terms or concepts in this chapter. Fix: Make a comparison table of the terms during revision.

6. Practice (exam-style)

Define the main term or principle covered in Chapter 4.
Give two real-life examples related to science in everyday life.
Solve a short numerical or descriptive question from this chapter.
State one important formula and explain each symbol.

7. Answer key (hints)

Refer to section 2 (Key concepts) above for the definition.
Examples should be drawn from daily experience and local context.
Apply the formula from section 3, show all steps clearly.
Formula with units — refer to the textbook glossary for symbol meanings.

8. Quick revision

Class 4 Science — Chapter 4: Science in Everyday Life.
Core idea: Simple machines and household tools.
Key outcomes: Identify simple machines in daily life; Explain how tools make tasks easier.
Always revise diagrams / tables from the Samacheer Kalvi textbook before the exam.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

How a pressure cooker works

Sealed lid → steam cannot escape → pressure inside increases → boiling point of water rises above 100°C (can reach ~120°C) → food cooks much faster. The weight/whistle releases excess steam to maintain safe pressure.

At high altitudes (like Ooty or Kodaikanal), water boils at a LOWER temperature (<100°C) due to lower atmospheric pressure. Food takes longer to cook in hill stations. A pressure cooker solves this problem.

How a thermos flask works

It has a double-walled glass bottle with a vacuum between the walls. Vacuum = no air = no particles for heat to travel through → prevents heat loss by conduction and convection. The silvered inner surface reflects heat radiation back → prevents heat loss by radiation. Result: hot water stays hot for 12+ hours.

The vacuum is the key. Sound cannot travel through a vacuum either. Astronauts in space cannot hear each other without radios because space is a vacuum.

Basic first aid

Cuts: wash with clean water → apply antiseptic (Dettol/Savlon) → cover with clean bandage. Burns: hold under cool running water for 10 minutes → do NOT apply butter, oil, toothpaste, or ice (these trap heat and worsen the burn). Insect bites: wash with water → apply a cold compress or ice pack wrapped in cloth → do not scratch (scratching can cause infection).

First aid is the FIRST help given before a doctor arrives. It prevents the injury from getting worse. Every child should know these basics.

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Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Applying butter, oil, or toothpaste to a burn

✓ This is a dangerous myth. These substances TRAP heat in the skin, worsening the burn. The correct first aid: cool running water for 10 minutes. Nothing else.

WATCH OUT

✗ Opening a pressure cooker immediately after turning off the flame

✓ The inside is still under high pressure and filled with superheated steam. Opening it causes a steam explosion. Wait for it to cool naturally, or carefully release the weight to let steam escape first.

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