华中科技

Helium is a colorless, odorless, and odorless gaseous inert gas at room temperature. It has the lowest critical temperature and is the most difficult to liquefy gas. It is extremely inactive and cannot burn or support combustion. The content of helium in the air is about 5.2 parts per million, and theoretically it can be separated and extracted from the air, but because its content is too thin, industrial helium is mainly from the United States, Russia, Algeria, and Qatar. % Of natural gas is separated and refined to obtain high-purity helium. With its low boiling point of -268.9°C, liquid helium can be used for ultra-low temperature cooling. Helium is indispensable in superconductor applications that have received wide attention in the field of levitating trains. In addition, due to its inactive chemical properties and lighter than air characteristics, helium is often used as the filling gas in spacecraft or advertising balloons, and this use is also well known. Helium is widely used in breathing mixed gases in the field of marine development and in the cooling of superconducting electromagnets in nuclear magnetic resonance imaging equipment in the medical field: military, scientific research, petrochemical, refrigeration, medical, semiconductor, pipelines Leak detection, superconducting experiment, metal manufacturing, deep sea diving, high-precision welding, optoelectronic product production, etc.