Doubt by Niyati
Solution : When an electric fan be switched on in a closed room, the air of the room become heated because due to the rotation of the fan the speed of the air molecules increases due to which the average kinetic energy of the air particles also increases and their temperature rises.
Why do we feel cold under the fan?
Why do we feel cold under the fan?
We feel cold under the because of evaporation of our sweat and evaporation always happened with cooling.
Why evaporation always happened with cooling?
The evaporation of a liquid from its surface happens because some molecules acquire velocities sufficient enough to escape from the attractive force at the surface, hence the average kinetic energy of the molecules left behind decreases. As average kinetic energy is directly related with temperature (KE∝T), this is why evaporation always causes cooling.