In which process the transfer of the heat is from one point to another due to the actual motion of the molecules of a fluid:?

Option 1 : Convection

Concept:

The movement of energy from one place to another is called energy transfer. Heat transfer mainly takes place due to temperature differences.

There are three modes of Heat transfer.

1. Conduction: The mode of heat transfer in solids where heat transfer takes place without the movement of medium particles is called conduction.
   For example:  By heating one end of a metal rod we can feel the heat at the other end.
    
2. Convection: The mode of heat transfer in fluids where heat transfer takes place due to the movement of particles or molecules (air or water) of the medium is called convection.
   For example, the heating of water in a pot
    
3. Radiation: The mode of heat transfer where heat is transferred from one place to another without affecting the medium particles is called radiation.
   The given diagram shows the way in which all three modes of heat transfer work.