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प्रश्न
What is wind? What precautions must be taken while placing a wind vane?
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उत्तर
The wind is air in motion. A wind vane indicates the direction of the wind and consists of a rotating arm pivoted on a vertical rod. The arrow of the wind vane always points in the direction from which the wind blows and the wind is named accordingly. For example, if the pointer is pointing to the East, the wind is blowing from East to West and, therefore, this wind is called an easterly wind. Wind vanes are usually placed away from obstacles such as high buildings, trees, etc.
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संबंधित प्रश्न
Write true or false. Correct the false statement.
The direction of wind blowing on the surface of the earth is affected by the Coriolis force.
Fill in the blanks
The pressure difference causes horizontal movement of air called _____ and vertical movement of air called ____.
Fill in the blank:
Humidity refers to the amount of moisture or __________ present in the air.
Fill in the blank:
The amount of cloud cover in the sky is expressed in ________
What is condensation?
What are the local winds? Give a few examples.
- The diagram alongside illustrates one of the factors that affect temperature. What is it?
- Which side of the mountain is likely to have houses and be covered with trees?
This could be a classroom activity. If your school laboratory has an anemometer, use it to record your city’s wind speed for a week. Use the Beaufort Scale to find out the character of wind during these days. Record your observations carefully in your notebook. You could even draw small neat sketches to show the effect of the wind.
What are the elements of weather?
Complete the following table.
| Weather | Climate |
| Short-lived condition of atmosphere | |
| Does not change quickly | |
| Expressed with respect to a specific place | |
| Elements of climate: Temperature, pressure, winds, humidity and precipitation |
