HEAT FLOW

1.The transfer of thermal energy from a hot area to a cool area is known as heat flow. 

2.This occurs when a certain object or material is at a different temperature than surrounding objects. 

3.The principle behind this process involves the fact that thermal equilibration needs to occur between objects, also known as the second law of THERMODYNAMICS

4.. In essence, when a difference in temperature exists between materials, the heat flow can only be slowed, not stopped.

CONDUCTION

TRANSFER OF HEAT IN SOLIDS FROM THE HOT END TO COLD END.