CBSE Class 8 Science Notes Chapter 6 PDF

CBSE Class 8 Science Notes Chapter 6 help students understand how air pressure influences weather conditions and leads to the formation of winds, storms, and cyclones. The chapter explains the science behind atmospheric phenomena that affect our daily lives and the natural environment.

These notes present the concepts in a simplified manner, covering atmospheric pressure, wind movement, thunderstorms, cyclone formation, and safety measures. With concise explanations and important exam points, the notes make learning easier and revision more effective for Class 8 students.

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CBSE Class 8 Science Notes Chapter 6 

The CBSE Class 8 Science Notes Chapter 6 PDF is designed to help students revise the chapter in a concise and organised manner. Below are the Pressure, Winds, Storms, and Cyclones notes: 

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1. Force per unit area

Force per unit area

SI unit → N/m² → pascals (Pa)

More area → Less pressure

Less area → More pressure

2. Pressure Exerted by Liquid

• On the bottom → depends upon the height of the water column.

[More height of liquid = more pressure at the bottom]

3. Atmospheric Pressure

Pressure exerted by a layer of air on the Earth's surface.

4. Rubber sucker

5. Bernoulli’s Principle

When speed of fluid increases, its pressure decreases.

High speed wind → Low air pressure

Low speed wind → High air pressure

6. Storm

• Warm air (Rises) → Low pressure

• Cool air from High pressure rush to low pressure.

7. Lightning

Lightning happens when +ve meets negative.

Lightning is possible between

1. Cloud + cloud → due to collision of +ve and –ve.

2. Cloud and ground → water clouds can’t handle a lot of charges.

Lightning → High temp → gases around it

8. Lightning Safety

• Stay away from tall objects.

• Crouch down

• Avoid umbrella’s with metal rod.

• find shelter

9. Lightning conductor (Safety measure)

• Metal rod placed on the top of tall building

• Another end connected to the ground.

• Provides harmless path to lightning

10. Cyclone → Spinning system of cloud, wind and rain

1. Heating → ocean water heats up and moist air rises.
   
   (Low Pressure)
   
   

2. Energy release →

Additional Points

• Eye of Cyclone → Central most part

• Lowest pressure

• Calm wind

• Cyclones become stronger when they move over the ocean.

• Cyclone weakens after reaching land as moist air supply stops.

11. Effect of cyclone

• Severe destruction

• Sea water pushed towards residential areas and pollutes fresh water

• Flood and landslides

12. Protection/Preparations

• Follow weather reports and IMD warnings.

• Tracking of cyclones.

• keep emergency kit ready

• Move to cyclone shelter.

Pressure, Winds, Storms, and Cyclones Class 8 Notes PDF

The Pressure, Winds, Storms, and Cyclones Class 8 Notes PDF is designed to help students understand the relationship between air pressure, wind movement, and extreme weather events. These notes explain how uneven heating of the Earth's surface creates pressure differences that lead to winds, thunderstorms, and cyclones.

With concise explanations and exam-focused points, it serves as a useful study resource for classroom learning, homework, and exam revision.

Pressure, Winds, Storms, and Cyclones Class 8 Notes PDF

How Do PW Class 8 Science Chapter 6 Notes Help in Exam Preparation?

PW Class 8 Science Notes simplify difficult topics and make revision more effective. Here’s how these notes help in exam preparation:

1. Simplified Explanations

Topics such as atmospheric pressure, wind formation, thunderstorms, and cyclones are explained in easy language for better understanding.

2. Quick Revision Support

These notes summarize the entire chapter into concise points, making last-minute revision easier and more effective.

3. Focus on Important Concepts

Key topics frequently asked in exams are highlighted to help students prioritize their preparation.

4. Better Concept Clarity

Real-life examples and systematic explanations help students understand how weather phenomena occur in nature.

5. Useful for School Exams

PW notes cover all major concepts from the CBSE syllabus and serve as a useful revision resource for tests and final examinations.