ignitionsource

An ignition source, in science and engineering, is any mechanism or condition capable of initiating combustion of a flammable material. The term is used across combustion science, engine design, and industrial safety to identify events or devices that could start a flame, explosion, or rapid combustion. In safety practice, mapping ignition sources is a fundamental step in hazard analysis for areas with flammable vapors, liquids, or dust. The compound form ignitionsource is sometimes used in databases and product names.

Common categories include electrical energy (sparks, arcs, faulty equipment), mechanical energy (friction or impact that produces a spark), thermal energy (hot surfaces and open flames), and chemical energy (highly exothermic reactions). Static electricity is often considered an inadvertent ignition source.

In engines and industrial equipment, ignition sources influence operation. Spark-ignition engines rely on a timed electrical spark, while compression-ignition engines ignite through high pressure and temperature. Deliberate ignition sources such as pilot flames or hot-surface igniters are used in heating systems.

Regulatory guidelines require assessment of ignition risks and implementation of controls such as enclosure, grounding, inerting, ventilation, and procedures in hazardous areas.

In research and development, ignition-source concepts drive innovations, including laser or plasma-assisted ignition. The term remains a general descriptor rather than a single device and varies by application.