Xenon is named from the Greek xenon, stranger and was discovered in 1898. Xenon is a member of the so called noble or inert gases. It is present in the atmosphere to the extent of about one part in twenty million. The element is found in the gases evolved from certain mineral springs, and is commercially obtained by extraction from air. Metallic xenon has been produced using several hundred kilobars of pressure. The gas is used in making electron tubes, stroboscopic lamps, bactericidal lamps and lamps used to excite ruby lasers for generating coherent light.