Advection is another form of transferring heat.
Radiation is the major method of heat transfer warming Bob's face. The hot fire gives off a large amount of radiation, while air is not a good conductor of heat, and Bob does not feel a warm wind indicating that advection is bringing warm air from next to the fire to warm his face. When two objects of different temperatures, such as the can of Bud and Bob's hand, come into contact, conduction transfers heat from the warmer object to the cooler object. The molecules in Bob's hand are not moving around to transport heat towards the can of Bud, so convetion is not taking place, and Bob's hand is not radiating a great deal of heat into the beer can. Convection is the major method of heat transfer causing the air at the top of the chimney to be warm.