Fires begin when a flammable or a combustible material combine together with a sufficient amount of oxidizer for example oxygen gas or another oxygen-rich compound (even though non-oxygen oxidizers exist, including chlorine),[56] is subjected to a source of warmth or ambient temperature over the flash point for the gas/oxidizer mix, https://natural-bookmark.com/story19882006/fire-risk-assessor-carlisle-for-dummies