Class8 Science Book Curiosity Chapter6 QA
Chapter 6 – Pressure, Winds, Storms and Cyclones VERY SHORT ANSWER (1 MARK) – IMPORTANT What is pressure? Pressure is the force acting per unit area. What is air pressure? The pressure exerted by air on objects. What causes wind? Difference in air pressure. What is a storm? A violent disturbance in the atmosphere. What is a cyclone? A rapidly rotating storm with very high wind speed. Name the instrument used to measure air pressure. Barometer. Which areas have low air pressure? Warm air regions. SHORT ANSWER (2 MARKS) – IMPORTANT Define pressure with formula. Pressure is force acting per unit area. Pressure = Force ÷ Area Why does air exert pressure? Because air has mass and is in constant motion. How does temperature affect air pressure? Warm air rises and creates low pressure, cold air sinks and creates high pressure. Why do winds blow from one place to another? Winds blow from high-pressure areas to low-pressure areas. What is the eye ...