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A weather vane is used to find out where the wind comes from.
Wind socks such as this one are often used on airports. They show the direction of the wind. They can also show how strong the wind is.

Wind is the flow of gases. On Earth, wind is mostly the movement of air. In outer space, solar wind is the movement of gases or particles from the sun through space. The strongest winds seen on a planet in our solar system are on Neptune and Saturn.

Short bursts of fast winds are called gusts. Strong winds that go on for about one minute are called squalls. Winds that go on for a long time are called many different things, such as breeze, gale, hurricane, and typhoon.

Wind can move land, especially in deserts. Cold wind can sometimes have a bad effect on livestock. Wind also affects animals' food stores, their hunting and the way they protect themselves.

Sunlight drives the Earth's atmospheric circulation. The resulting winds blow over land and sea, producing weather.

If there is a high pressure system (that rotates clockwise in the northern hemisphere) near a low pressure system (that rotates counter-clockwise), the air will move from the high pressure to the low pressure to try and even out the pressures. A big difference in pressure can make high winds. In some storms, such as hurricanes, typhoons, cyclones, or tornadoes, the pressure differences can cause winds faster than 200 mph (320 kilometres per hour ). This can cause damage to houses and other buildings, and can also lead to death.

Wind can also be caused by the rising of hot air, or the falling of cool air. When hot air rises, it creates a low pressure underneath it, and air moves in to equalize the pressure. When cold air drops (because it is denser or heavier than warm air), it creates a high pressure, and flows out to even out the pressure with the low pressure around it.

The wind is usually invisible, but rain, dust, or snow can let you see how it is blowing. A weathervane can also show you where the wind is coming from. The Beaufort scale is a way to tell how strong the wind is. It is used at sea, when no land can be seen.

The increase in wind causes an increase in the rate of evaporation.


See also: Severe weather
Damage from Hurricane Andrew

High winds can cause damage depending on how strong they are. Sometimes gusts of wind can make poorly made bridges move or be destroyed, like the Tacoma Narrows Bridge in 1940.[1] Power can go out because of wind, even if its speed is as low as 23 knots (43 km/h). This is because tree branches could change the flow of energy through power lines.[2] No species of tree can resist hurricane-force winds, but trees with roots that are not very deep can be blown over more easily. Trees such as eucalyptus, sea hibiscus, and avocado are brittle (easy to break) and are damaged more easily.[3]

In outer space

Wind in outer space, called solar wind, is very different from a wind on earth. The wind in outer space is caused by the sun, and it is made up of particles that came out of the sun's atmosphere. Like solar wind, the planetary wind is made up of light gases that have come out of planets' atmospheres.

Planetary wind

The doldrums in January (blue) and July (red).

The doldrums are in the equatorial region. It is a wind belt where air is warm, with little pressure variations. Winds are light there. Another name for doldrums is Intertropical Convergence Zone (ITCZ).


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