Class 8 Science - HARYANA
Pressure Winds Storms and Cyclones
This chapter in Haryana Board (BSEH) Class 8 Science explores the dynamic nature of air and atmospheric pressure. Students will learn how uneven heating of the Earth generates winds, and how high-speed winds combined with low pressure create destructive natural phenomena like thunderstorms and cyclones. The chapter also covers safety measures against cyclones and the role of modern technology in forecasting them. This topic is vital for board exams as it tests both conceptual understanding and practical safety applications through regular short and long-answer questions.
Start Learning FreeKey Concepts
Atmospheric Pressure
The pressure exerted by the weight of air in the atmosphere on Earth's surface, which decreases as altitude increases.
Wind Generation
High-speed air moving from regions of high pressure to low pressure, primarily caused by the uneven heating of the Earth by the sun.
Thunderstorms
Storms accompanied by lightning and heavy rain, developed in hot, humid tropical areas due to rising warm air currents.
Cyclones
Large-scale revolving storms characterized by a low-pressure center (eye) surrounded by rapidly circulating high-speed winds and heavy rains.
Wind Vane and Anemometer
Instruments used to measure wind direction and wind speed respectively.
Important Formulas
Board Exam Info
In Haryana (BSEH) Class 8 Science exams, this chapter typically carries around 5 to 7 marks. Questions frequently include 1-mark objective questions, 2-mark definitions, and 3-to-5-mark descriptive questions explaining the formation of cyclones or safety measures.
Frequently Asked Questions
Why does air exert pressure?
Air is made of tiny molecules that are in constant motion and have weight, so when they collide with surfaces, they exert pressure.
What is the center of a cyclone called and what are its features?
The center of a cyclone is called the 'eye'. It is a calm, cloudless area with very low pressure.
Why do roofs fly off during a high-speed storm?
High-speed winds blowing over a roof create a region of low pressure above it, while the higher pressure inside pushes the roof upward and blows it away.
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