WIND

WIND

Introduction

There is a air all around us. We can feel it when it moves. Moving air is called wind. The wind blows at different speeds. It can be gentle as well as strong. 

When the wind blows slowly and gently, it is called Breeze. 

When the wind blowing is slightly faster and stronger, it is called a gale. It can move leaves and branches of trees. 

the wind blows at a much higher speed than the gale, it is called a storm. A storm can uproot trees.

Cyclone is a huge revolving storm that starts over oceans and loses its strength as it moves towards the land. The wind in a cyclone moves in a spinning manner with great speed.

It can cause a lot of damage to plants and houses. A cyclone is also called a hurricane or a typhoon.

Formation of Wind

Fix the mouth of a plastic bottle with a balloon. Now place the plastic in hot water. The balloon starts to inflate. This is because the air inside the bottle becomes hot and rises to inflate the balloon. This shows that hot air rises.

The sun heats the surface of the Earth. Some parts get direct sunlight and become hotter. The air above these areas becomes warmer and rises, like we saw the hot air rise up the balloon. The cool air from the surroundings moves into the place of warm air.

Land and Sea Breeze

The sun heats up both the land and sea. However, the land heats up faster than water. The air above the land becomes hotter faster and rises. The cold air above the sea rushes to take its place. This is called a sea breeze. 

The unit measure for wind speed is called Knots.

At night, the land cools faster than the sea. The air above the sea is hotter than the air above the land. As this air rises,

cold air from the land blows towards the sea to take its place. This is called a land breeze.

The coastal regions experience the sea breeze during the day breeze during the night.

Monsoon Winds

Monsoon wind is the winds that bring rain with it. In summers, the land becomes hot faster than the seas. The warm air above the land rises and the cool air from the sea takes its place. 

 As this air coming from the sea has lots of water vapour in it, it brings rainfall.