Freight Surcharges. BAF refers to floating part of sea freight charges which represents additions due to oil prices. Usually BAF charges are determined by Carrier Conferences to be applicable for a certain period on a certain trade route. These Carrier Conferences are seen as a cartel for fixing prices.
Heat transfer. Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.
As you can imagine, the most basic method is conductive heat transfer. Simply place the two objects in contact with each other, and the molecular vibrations from one object will case the molecules in the other object to begin vibrating. The thermal conductivity of the objects involved plays a big part in how much heat is transferred.