Explanation

Question

Explain briefly about convection and radiation

 

 

 

 

Answer 1

Convection currents occur because of a difference in density in hot and cool fluids.  Hotter air is less dense than cooler air, which leads to hot air rising.  As the air cools, it begins to sink down.  If there is a heat source on one side of the room, the air will be rising near the heat source.  On the opposite side of the room, the air will be cooler because of the distance from the heat source.  The rising air on one side with the cooling air on the other will create a circular current of air flow.

 

By radiation, I assume you mean thermal radiation.  Waves within the visible spectrum (light we can see) and waves outside the spectrum (Infrared Radiation) are both common forms of thermal radiation.  Thermal radiation always has a large range of frequencies, but most of the heat felt will always be infrared radiation.  If you need further help with radiation, I suggest learning about the electromagnetic spectrum first.