This book discusses the different energy sources bringing about fires, explosions, and detonations in combustibles under different levels of confinement.  Focus is on the initiation source for a combustible whether it is a gas, a liquid, or a solid in a given state of confinement. Incidents of oxygen-related fires in hospitals which were particularly evident with increased usage of oxygen therapy for the extremely ill COVID-19 patients in 2021 are discussed with details of formation, accumulation, and dissipation of charges and their discharges leading to fires and explosions. Sympathetic...