In Science Class 8 Chapter 6 Pressure, Winds, Storms, and Cyclones, students explore the fascinating relationship between force, pressure, and their role in shaping natural events like winds, storms, and cyclones.
You will learn how liquids and gases exert pressure in all directions, how differences in air pressure cause winds, and why high-speed winds can lead to dangerous storms.
The chapter also explains the formation of thunderstorms, lightning, and cyclones, along with safety measures to protect life and property. Real-life examples and experiments make these concepts easy to understand and connect with daily life.
Pressure Winds Storms and Cyclones Worksheet
Our worksheet provides comprehensive practice for Pressure, Winds, Storms, and Cyclones. It includes fill in the blanks, MCQs, true or false, assertion and reason, short-answer questions, and long-answer questions. The questions help students revise key concepts such as pressure, liquid and atmospheric pressure, wind formation, thunderstorms, lightning, cyclones, and safety precautions.
Our engaging and well-structured worksheets help students reinforce classroom learning, strengthen their understanding of science concepts, prepare effectively for exams, and build a strong foundation in science.
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Science Class 8 Chapter 6 Study Notes
Pressure
Definition: Force acting per unit area.
Formula: Pressure = Force / Area
Unit: Pascal (Pa) = 1 N/m²
Observation: Smaller area → greater pressure; larger area → lesser pressure.
Examples:
- Broad bag straps reduce shoulder pain.
- Broad bucket handle is more comfortable.
- Cloth pad on head while carrying load.
- Sharp knife cuts better than blunt knife.
Liquid Pressure: Depends on height of the liquid column, not its volume.
Liquids exert pressure in all directions – at bottom and on the walls of the container.
Applications: Overhead tanks placed at height, broad base of dams.
Air Pressure
Atmosphere: Envelope of air around Earth, contains nitrogen, oxygen, CO₂, etc.
Atmospheric Pressure: Pressure exerted by air in all directions.
Magnitude: On 15 cm × 15 cm area → ~2250 N force (equal to 225 kg weight).
Balanced Pressure: We are not crushed because internal body pressure equals external atmospheric pressure.
Formation of Wind
Air moves from high pressure to low pressure areas.
Sea Breeze: Day – land heats faster → low pressure over land → air from sea moves in.
Land Breeze: Night – sea warmer → low pressure over sea → air from land moves in.
High-Speed Winds and Pressure
High-speed winds → low air pressure.
Example: Roofs blown away during storms due to pressure difference.
Safety: Keep windows and doors open during strong storms to reduce pressure difference.
Storms, Thunderstorms, and Lightning
Storm: Strong winds with rain/hail/snow.
Thunderstorm Formation:
- Warm moist air rises → low pressure.
- Cools and condenses → clouds form.
- Updrafts and downdrafts cause collisions → static charges form.
- Lightning occurs when charge difference becomes large.
Lightning Safety: Stay indoors, avoid tall objects, crouch low, avoid water and metal.
Cyclones
Form over warm ocean waters.
Warm moist air rises → low pressure → more air rushes in.
Earth’s rotation → spinning winds around eye of cyclone.
Eye → calm, surrounded by destructive winds.
Dangers: Storm surge, flooding, property destruction, crop loss.
Safety: Follow IMD alerts, use cyclone shelters, prepare emergency kits.
Pressure Winds Storms and Cyclones Extra Question Answers
Q1. What is atmospheric pressure?
Answer: The envelope of air surrounding the Earth is called the atmosphere. Air exerts pressure on all objects around us, and this pressure is called atmospheric pressure.
Atmospheric pressure is exerted because of the weight of the column of air above us. We are not crushed by this pressure because the pressure inside our bodies also balances the atmospheric pressure outside.
Q2. Why does air move from a region of high pressure to a region of low pressure?
Answer: Air moves from a region of high air pressure to a region of low air pressure because of the difference in pressure between the two regions. Air continues to flow as long as there is a pressure difference. When the pressure becomes equal, the flow of air stops.
Q3. What is the difference between a sea breeze and a land breeze?
Answer: A sea breeze occurs during the day. Land gets heated faster than water, so the air above the land becomes warm and rises, creating a low-pressure area. Cooler air from the sea moves towards the land, producing a sea breeze.
A land breeze occurs at night. The land cools faster than the sea, so a low-pressure area develops over the warmer sea. Air then moves from the land towards the sea, producing a land breeze.
Q4. How does a cyclone form?
Answer: A cyclone forms mainly over warm ocean waters. Warm, moist air above the ocean rises and creates a low-pressure area. As the water vapour condenses, heat is released, causing the air to rise further and lowering the pressure even more. Air from surrounding regions rushes towards the low-pressure area and also rises. Due to the Earth’s rotation, the moving air begins to spin. This process continues and forms a system of strong rotating winds, clouds, and rain called a cyclone. The calm central region of a cyclone is called its eye.
Q5. What precautions should be taken during a cyclone?
Answer: The following precautions should be taken during a cyclone:
- Stay updated with weather reports and warnings issued by the India Meteorological Department (IMD).
- Keep an emergency kit ready with essential items.
- Follow the instructions given by local authorities.
- Move quickly to a designated cyclone shelter when advised.
- Stay indoors and away from windows during strong winds.
- Avoid flooded areas, fallen electrical wires, and damaged structures.
- Do not go outside until authorities announce that it is safe.
These precautions help reduce the loss of life and property during cyclones.