Liquid Air

Liquid air is air that has been cooled to cryogenic temperatures until it condenses into a pale blue mobile liquid, stored in specialized vacuum-insulated containers to keep it away from room temperature. It can absorb heat rapidly and revert to its gaseous state, a property that makes it useful for condensing or solidifying other substances, and it also serves as an industrial source of nitrogen, oxygen, argon and other inert gases through the process of air separation. Its capacity to store and release energy as it warms and expands is the basis of liquid air energy storage systems.