Heat transfer is the exchange of thermal energy between physical systems. The rate of heat transfer is dependent on the temperatures of the systems and the properties of the intervening medium through which the heat is transferred. The three fundamental modes of heat transfer are conduction, convection and radiation.
Publisher. A+E Networks. In an event that is widely acknowledged to have sparked the outbreak of World War I, Archduke Franz Ferdinand, nephew of Emperor Franz Josef and heir to the Austro-Hungarian Empire, is shot to death along with his wife by a Serbian nationalist in Sarajevo, Bosnia, on this day in 1914.
It starts when a fuel (such as a liquid fuel or flammable gas), oxygen, and heat are mixed in the right proportions and is sparked by something that starts the reaction, such as an electrical spark, mechanical spark, open flame or match. To stop a fire, one of these elements has to be removed from the situation.