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After completing this Lesson, you will be able to answer: 1. What is wind and how wind moves? 2. What is anemometer ?

Module 3: Weather Elements. Virtual Academy for the Semi Arid Tropics. Modules. Lessons. Lesson 6: Wind velocity. After completing this Lesson, you will be able to answer: 1. What is wind and how wind moves? 2. What is anemometer ? 3. How cup anemometer measures wind speed?.

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After completing this Lesson, you will be able to answer: 1. What is wind and how wind moves? 2. What is anemometer ?

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  1. Module 3: Weather Elements Virtual Academy for the Semi Arid Tropics Modules Lessons Lesson 6: Wind velocity After completing this Lesson, you will be able to answer: 1. What is wind and how wind moves? 2. What is anemometer ? 3. How cup anemometer measures wind speed? Course on Crop-Weather Relationships

  2. Lesson 6: Wind velocity • Winds begin with differences in air-pressures. • Pressure that is higher at one place than another sets up a force pushing from the high toward the low pressure. • The greater the difference in pressures, the stronger will be the wind force.

  3. Lesson 6: Wind velocity • The distance between the area of high pressure and the area of low pressure also determines how fast the moving air is accelerated i.e. Wind velocity. • Wind velocity includes both wind speed and wind direction. • Wind velocity is measured using anemometer in a weather station.

  4. Lesson 6: Wind velocity Anemometer • Cup anemometer is used to measure the wind speed from the speed of rotation of a windmill which consist of 3 or 4 hemispherical or conical cups, each fixed to the ends of horizontal arms attached to a vertical axis. • Rotation of cups is transmitted to a technical counter which records the wind speed. Cup anemometer

  5. Module 3: Weather Elements Virtual Academy for the Semi Arid Tropics Modules Lessons This concludes Lesson 6 on wind velocity in this Module. The last Lesson in this Module is about cloud cover. Click “Lessons” button to select Lesson 7 Course on Crop-Weather Relationships

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