This invisible force

What is this invisible force called 'wind' ? I don't really think about it too much, but do get nervous when the wind picks up and is very strong. I think this is a reaction to the years spent in cyclone zones and having first hand experience of the destructive force of the wind.

I found some lovely quotes about wind-

"Wind is what happens when air falls in love with itself." Barry Webster

"The wind plays its own music."Bert McCoy

"A great wind is blowing, and that gives you either imagination or a headache." Catherine the Great