an internal combustion engine usually converts fuel / chemical energy into mechanical energy and heat energy through combustion
internal_combustion_engine is combustion_engine. engines is internal_combustion_engines. gas_engine is internal_combustion_engine. internal_combustion_engine is engine. internal_combustion_engine is heat_engine. two_cycle_engine is internal_combustion_engine. diesel is internal_combustion_engine. gasoline_powered_engine is internal_combustion_engine. gasoline_engine is internal_combustion_engine. internal_combustion is combustion.