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Air Expands on Heating - Winds, Storms and Cyclones - CBSE Class 7 Science Video Lecture

FAQs on Air Expands on Heating - Winds, Storms and Cyclones - CBSE Class 7 Science Video Lecture

1. How does air expand on heating?

Ans. When air is heated, the molecules of air gain energy and move faster. This increase in molecular motion causes the air to expand and occupy more space.

2. What are the effects of expansion of air on winds?

Ans. The expansion of air on heating creates a difference in air pressure. This difference in pressure leads to the formation of winds. Warm air rises due to its low density, creating an area of low pressure. Cooler air from surrounding areas then rushes in to fill this void, resulting in the formation of winds.

3. How does the expansion of air contribute to the formation of storms?

Ans. The expansion of air plays a crucial role in the formation of storms. When warm and moist air rises rapidly, it cools down at higher altitudes. This cooling causes water vapor to condense, forming clouds. As the air continues to rise, the condensing water vapor releases latent heat, which further warms the air and causes it to expand. This expansion creates low-pressure zones, which intensify the storm system and contribute to the formation of thunderstorms, hurricanes, or cyclones.

4. What are cyclones and how are they related to the expansion of air?

Ans. Cyclones are intense low-pressure systems characterized by strong winds and heavy rainfall. The expansion of air due to heating plays a crucial role in the formation of cyclones. As warm and moist air rises rapidly, it forms an area of low pressure near the surface. This low-pressure zone draws in more warm and moist air from surrounding regions, leading to the formation of a cyclone.

5. How does the expansion of air contribute to the movement of winds and cyclones?

Ans. The expansion of air on heating creates differences in air pressure, which in turn leads to the movement of winds and cyclones. Air always moves from areas of high pressure to areas of low pressure. In the case of winds, the expansion of air due to heating creates a region of low pressure, and air from surrounding areas moves towards this low-pressure zone, resulting in the movement of winds. Similarly, in cyclones, the expansion of air creates a low-pressure system, and air rushes towards this system, causing the cyclone to move.

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Mar 07, 2025 Last updated

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