Question

It is hotter over the top of fire than at the same distance on the sides because of:

• A. Convection of heat
• B. Conduction of heat
• C. Radiation of heat
• D. All of the above

Answer 1

The correct option is A Convection of heat

Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises, and hence at the top of the fire, this warm air is felt much compared to the sides.