Why is electric fan related to physics?

An electric fan is an electric motor with some fan blades attached to its rotating shaft. As the motor spins, the fan blades rotate. Each blade is angled a bit, and as the inclined plane of the blade moves through the air, it forces the air ahead of it forward. Each blade does this on a continuous basis, and the result is a moving air stream. The fan is taking air from the area behind itself and blowing it out the front. The fan generates a movement of air, causing the warm, less dense air to rise, and the cool, dense air to descend, thus creating a feeling of coolness in the air.