- You may be looking for petrol, also known as gas.
Gas was a state of matter.
Earth at an early stage of its development was an enormous mass of superhot gases surrounding a core of molten rock. Over millions of years, the sun "eroded away" the gases, causing the planet to solidify. (AUDIO: Exploration Earth)
The Zircon planned to wipe out the population of Earth using a galactic cyclone created by the destruction of a dying planet. By the time it approached Earth, it was a cloud of poison gas. (COMIC: Doomcloud)
The Gelth were made of gas. When a human body decomposed, they produced gas, and the Gelth used this fact to use the corpses of Charles Dickens' driver and his coach as vehicles. (TV: The Unquiet Dead)