A fan creates air movement through the following mechanism:

1. The electric motor in the fan spins the blades or propellers.

2. As the blades spin, they push air molecules in one direction, creating an area of low pressure on one side of the fan.

3. This difference in pressure causes the air around the fan to be drawn towards the low pressure area, creating an airflow or breeze coming from the fan.

4. The speed of the fan blades determines the velocity and volume of the airflow produced. Faster spinning blades will create a stronger, more forceful airflow.

5. The shape and pitch of the fan blades also affects the airflow, with designs optimized to maximize air movement efficiently.

So in summary, the spinning motion of the fan blades creates a pressure difference that draws surrounding air into the fan, resulting in the desired air movement or breeze. The motor power and blade design determine the characteristics of the airflow.