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
Our modern world relies extensively on batteries – and their strength and recharge-ability taxes our research scientists considerably. Lithium is the […]
Sputtering as a means of thin film deposition has been used for many years. From time-to-time new techniques, or variations in […]
The International system of scientific units is having a shake-up; with four of the basic measurement units (the ampere, kilogram, kelvin and […]
The development of thin film magnetic devices is a relatively new and exciting science, and Nordiko has been at the forefront in […]