May 10, 2014

Air & Liquid Air

Air is the mixture of gases that surrounds the Earth. Air contains mainly the gases nitrogen and oxygen, with small amounts of argon and other noble gases and carbon dioxide. The proportions of these gases in air are the same anywhere around the world. Air also contains water vapor, dust, and polluting gases, which vary in amount from place to place. When air is cooled to -328°F (-200°C), most of the gases condense, forming a blue liquid called liquid air. (Dictionary of Science, by Neil Ardley)