Question

Observe the shape of blades of a fan and discuss the nature of the air flow when fan is switched on.

Answer 1

1. The blades of a fan are slightly curved and inclined rather than flat.
2. When the fan is switched on, the rotating blades push air and produce a continuous flow. The air moves mainly perpendicular to the plane of rotation.

Thus, the shape and inclination of the blades help the fan move a large amount of air efficiently.