People not only use oxygen, but als

People not only use oxygen, but also find uses for other gases in the air. For a long time, argon, which contains only 1% of the air, was of no industrial use. But now, sophisticated machinery can extract 1 million cubic meters of argon a year from the air, and more than 1 billion light bulbs are filled with it each year.I'm sure we've all seen the billboards in the stops while we're waiting for the bus, some of which have bulbs filled with neon gas. Neon gas is present in very little amount in the air, only a few parts per million; Helium is also extracted from the air. Helium was first discovered on the sun and is less abundant in the air than neon. In addition to the air, helium can be collected from gases spewed out of the ground. Helium has been used to fill airships, and in industry it has also been used to achieve minimum temperatures.