The wind blows because of differences in air pressure from one location to another.Wind blows from areas of hight pressure toward areas of low pressure.If the high pressure area is very close to the low pressure area, or if the pressure difference is very great, the wind can blow very fast.
In this project veproject1 creates wind, by using a glass tube where he places at both ends of the tube two glasses one filled with ice and the other filled with boiling water, in the middle of the tunnel/tube he has placed a fan that rotates and shows that wind is created.
Since warm air is less dense and creates less air pressure, it will rise; cold air is denser and creates greater air pressure, and so it will sink.when warm air rises, cooler air will often move in to replace it.
So wind often moves from areas where it’s colder to areas where it’s warmer. The greater the difference between the high and low pressure or the shorter the distance between the high and low pressure areas, the faster the wind will blow.