An article about different sources of heat like: solid fuel (coal); liquid fuels (gasoline and oil) and gaseous fuels (propane and natural gas) all contain chemical energy.
An article about the sources of heat energy. The capacity of a physical system to perform work is called energy. There are different types of energy, such as heat energy, mechanical energy, light energy, sound energy and electric energy. Heat energy is produced when there is a transfer of heat from a warm object to a cool object.