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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 ? PowerPoint Presentation

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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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

- 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.

- 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.

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

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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