9.1: Introduction
- Page ID
- 46258
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Map of wind barbs and isobars (Public Domain).
Wind is the movement of air relative to the Earth’s surface. As with all moving things, it is caused by a force acting on it. Force is a pull or push that changes the resting state, motion, or direction of an object. Force can also cause objects to accelerate. Human skin can sense wind when an uncountable number of molecules collide with us as they flow along in the air, and sense the pressure changes in the air flow.