Convection
What is convection?
The transfer of thermal energy by means of currents in a fluid, liquids or gases.
How does convection work?
Definition:
Convection currents occur only in fluids such as liquids and gases as it involves the bulk movement of the fluids which carry thermal energy with them.
When the flask containing water is heated, it expands. The expanded water which is the hot part is less dense than the surrounding water, therefore it will rise up. The cooler part of the water at the upper part of the flask will sink as they are denser. The same principle applies for air.
Common applications of convection
1) Electric kettles
2) Household hot water system
3) Air conditioners
4)Refrigerators
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