Answer:
Heat transfer is a part of thermal engineering that deals with the generation, use, conversion, and exchange of thermal energy between physical systems.
Conduction: Transfer of heat by the direct collision of molecules.
Convection: Transfer of heat by carrying thermal energy along with the fluid being heated and moving away from the source.
Radiation: Transfer of heat by the emission of electromagnetic waves.
examples of heat transfer:
Conduction:
Touching a stove and being burned
Ice cooling down your hand
Boiling water by thrusting a red-hot piece of iron into it
Convection:
Hot air rising, cooling, and falling (convection currents)
An old-fashioned radiator (creates a convection cell in a room by emitting warm air at the top and drawing in cool air at the bottom).
Radiation:
Heat from the sun warming your face
Heat from a lightbulb
Heat from a fire
Heat from anything else which is warmer than its surroundings.
