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| Anemometer |
The term ‘air velocity’ refers to ‘wind velocity’ for a
practical measurement of air. The air/wind velocity is measured by “Anemometer”
an instrument used scientifically.
Anemometer consist of four hemispherical cups, two crossed metal arms
(those cups and metal arms are attached together), vertical spindle, anemometer
box included with cyclometer. Air velocities are calculated by cyclometer, it
shows the accurate reading of air velocity.
How air
velocity is measured?
The spindle of anemometer is placed normally in an open wide
place at a height of 10 meter. Velocities are recorded in meter per second
(m/s).
Different
velocities of air/wind
We know that when velocity of air increased the wind known as
storm or any other names. These names are called up on difference of velocities
of air. Just look the table below;
|
Air velocity
|
Type of wind
|
Examples in nature
|
|
0.5 m/s
|
Calm wind
|
Like smoke
rising motion
|
|
3.3 m/s
|
Slight
breeze
|
Like leave
rustling motion
|
|
10 m/s
|
Strong wind
|
Like tree
branch’s motion
|
|
15 – 20 m/s
|
Storm
|
Trees are
down to ground
|
|
25 – 30 m/s
|
Gale
|
Destroys homes & other
slightly
|
|
30 – 50 m/s
|
Hurricane
|
Leads to a
complete disaster
|
 |
| Katathermometer |
Besides anemometer, there is another instrument called ‘Kata
thermometer’. It is used for same purpose and measured the slight air
movements.
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