“Pyrophoric” comes from the Greek word for “fire-bearing”—purophoros—and describes substances, such as uranium or iron sulfide, that are highly reactive and ignite spontaneously when exposed to air or even, strange as it sounds, to water. Though it may seem like they should be handled only in controlled environments, pyrophoric alloys are used to produce the spark in a very common household item: the automatic lighter. What special equipment is needed to put out a pyrophoric fire? Discuss