A gas which can be liquefied only at very low temperatures, and was formerly believed to be incapable of liquefaction; specifically a gas that is above its critical point, and so is impossible to liquefy by pressure alone. Nitrogen and Oxygen, the major constituents of air, are both permanent gases. Water vapour can be readily condensed at room temperature. It is not a permanent gas and is removed from a vacuum system under evacuation much more slowly than Nitrogen and Oxygen.
« Back to Glossary IndexYou may also like
One of the many reasons why Smartphones are so clever is to do with their incredible glass screens. Gorilla Glass was developed […]
Nordiko Technical Service, Ltd. Appoints North American Nanotech, Inc. North American Sales Agent October 1, 2019 Nordiko Technical Service, Ltd. and North […]
The start of 2020 brought with it a global pandemic, which has not only tragically taken many peoples’ lives, but has also […]
Our lovely 2018 calendar reflects a summer holiday spent in Sicily in 2017. It almost goes without saying that the weather and […]