Question

A fan produces a feeling of comfort during hot weather, because ____________.

• A. our body radiates more heat in air
• B. fan supplies cool air
• C. conductivity of air increases
• D. our perspiration evaporates rapidly

Answer 1

The correct option is C conductivity of air increases

Radiation is the heat transfer by electromagnetic waves or photons. It does not need a propagating medieval. The heat radiated by the sun can be exchanged between the solar surface and the Earth's surface without heating the transitional space.
While, convection happens when a substance that can flow, like water or air is heated in the presence of gravity.
On the other hand, conduction is the flow of heat through solids and liquids by vibration and collision of molecules and free electrons.