Gas

Gas was a state of matter that expanded to fill a space. Gases could be invisible, such as oxygen, or could appear as a visible, misty substance, such as Clouzon-36. Many planets had an atmosphere, a collection of gases that formed a relatively thin veil over the world's surface. Most living organisms required gas to breathe, while some gases were poisonous to certain species. Some gases could also be used as drugs, such as to render individuals unconscious.

Gases included:
 * Ammonia
 * Clouzon-36
 * Dioxis
 * Durilliam
 * Hydrogen cyanide
 * Kesium gas
 * Knockout gas
 * Methane
 * Oxygen
 * Rethen
 * Tibanna
 * Vanoorian ammonia

Appearances

 * Star Wars: Episode I The Phantom Menace
 * "Bottleneck"&mdash;The Rise of the Empire
 * A New Dawn
 * Lost Stars
 * Battlefront: Twilight Company
 * Star Wars: Episode IV A New Hope
 * The Original Trilogy Stories
 * Star Wars Battlefront
 * Star Wars: Princess Leia, Part I
 * The Weapon of a Jedi: A Luke Skywalker Adventure
 * Star Wars: Episode V The Empire Strikes Back
 * The Empire Strikes Back: So You Want to Be a Jedi?
 * Aftermath
 * Bloodline
 * "The Perfect Weapon"
 * "The Crimson Corsair and the Lost Treasure of Count Dooku"
 * Before the Awakening
 * Aftermath
 * Bloodline
 * "The Perfect Weapon"
 * "The Crimson Corsair and the Lost Treasure of Count Dooku"
 * Before the Awakening