Write one difference between natural convection and forced convection.

Explanation

Natural convection
If the material moves due to the density difference , the process of heat transfer is called natural convection .In this case dence parts of the fluid rises and is replaced by the more dense cooler parts This convection is responsible for different types of winds .
Forced convection
In this convection heated part of material is moved with the help of external agency like a pump , the is process of heat transfer is called forced convection .Air conditioning is an example of this type .