Why does the wind blow?
AnswerIf air pressure varies between locations, the wind blows. Example: The air pressure is higher in an inflated balloon than outside it. If a hole is made in the balloon, the air streams out, creating a wind that blows from the greater pressure in the direction of the lower. The wind settles when the pressure is the same inside the balloon as outside. In the atmosphere the pressure at the earth's surface reflects the weight of air above it, which in turn is determined mostly by its temperature, and as people generally know from everyday life, hot air is lighter than cold. This fits with the fact that depressions (low pressure systems) usually bring warm air.
The wind blows because of differences in air pressure.
Um þessa spurningu
Haraldur Ólafsson veðurfræðingur. „Why does the wind blow?“. The Icelandic Web of Science 27.12.2005. http://why.is/svar.php?id=5512. (Skoðað 30.5.2016).
Haraldur Ólafsson veðurfræðingurprófessor í veðurfræði við HÍ