Question

why do wind mills and paper fans rotate ​

Answer 1

Answer:

The blade design creates a pressure difference in wind—high pressure on one side and low pressure on the other—that causes the blades to turn. ... For this reason, most ceiling fans incorporate blades that are comparatively inefficient drag devices; rotating the pitched blades pushes air vertically out of the way.

Answer 2

Explanation:

When the wind blows, a pocket of low-pressure air forms on one side of the blade. The low-pressure air pocket then pulls the blade toward it, causing the rotor to turn. This is called lift. The force of the lift is much stronger than the wind's force against the front side of the blade, which is called drag .And the wind mills and paper fans rotate