Point A heat transfer as steam is type of a convection heat transfer
Point B a source is the type of conduction heat transfer
What is conduction and convection heat transfer ?
Conduction = It is a process of heat transfer in which energy is transferred between successive molecules For example If we put the one end of the spoon to the boiling water then other end also become hot due to conduction.
Convection = It is type of heat transfer in which the heat flows due to movement of molecules or convection currents. convection heat transfer takes place in water and gases.
Just like this at point B the heat is transferred from one molecule to other which is conduction.
And point A heat transferred from steam which is convection as explained in above definition.
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