Convection+by+Salman

= Convection =

Definiton

 * Heat transfer in a gas or liquid by the circulation of currents from one region to another.

Facts

 * 1) Air heated by a space heater rises and is replaced by cool air, creating a convection current that circulates hot air through the room.
 * 2) Heat transfer by convection involves the motion of molecules in currents in liquids and gases.
 * 3) Heated molecules speed up and spread out, causing the warmer part of the liquid or ags to become less dense than the cooler part.
 * 4) The heated portion rises, creating currents that carry heat.
 * 5) Convection is one cause of rising air in our atmosphere, usually warm air rises above cold air.

Examples

 * Hurricanes
 * Forced Convection
 * Air conditioner fans