Where wind comes from…
Differences in temperature, causes differences in pressure. A difference in pressure across distances is called a pressure gradient, and this drives the wind.

Two examples of airflow caused by pressure gradient.
a) When a can of coffee is vacuum packed air is remove from the can, when the can is opened you can hear air rush in from the outside higher pressure. Similarly,
b) When you blow up a balloon you create a high-pressure area because you compress the air and increase its density within the balloon. When the balloon is punctured the air rushes outwards to the lower pressure.

In both examples, air moves from a higher to lower pressure, the greater the difference the faster the air will travel…

Wind is the result of pressure differences in the earth’s atmosphere. The wind is caused by the air flowing from an area of high pressure to an area of low pressure, the reason for pressure differences are to do with the rotation of the earth and the heating effect of the sun.

Wind is the movement of air caused by unequal heating of the earth’s surface by the sun. The movement of the air is in the form of convection current. When air next to the earth is heater, it expands and becomes lighter. This warmer lighter air is pusher up by the colder, heavier air that surrounds it.

The colder heavier air now is heated and becomes lighter, being pushed up in turn by more cold heavy air that surrounds it. this process continues until there is a steady flow of air, called a convection current, with warm air rising and cold air falling cold air is heavier so it exerts a greater pressure than warm air, so winds are formed when the cold air from high pressure areas moves to low pressure areas where the air is warm.

How to measure wind
If you can’t see the wind, how can you tell how fast it is moving?
Actually, it’s very easy. The you can’t see the wind, but you can see what it does to other things around you. You know it is windy because you can feel the breeze on your face. You can see the leaves in the trees outside shaking. You can hear the flags waving very loudly.
Let’s talk about wind speed. We can describe it in mph. That is the same way we describe how fast the car moves. But instead of looking at the car’s speedometer, we will use the natural wind speedometer that is all around us in nature… learn how

The other thing to watch for his wind turbulence. Turbulence is what happens when the wind gets bumpy. And it’s is very difficult to fly kite well in bumpy wind!