Helium is a colorless, odorless, non-flammable gas with an air content of about 5.2 parts per million. Chemically completely inactive, usually not combined with other elements or compounds. Theoretically, it can be separated from the air, but because its content is too thin, helium is separated and refined from natural gas containing about 0.5% helium in industry.

Chemical formula He

Molecular weight 4.003

Gas density 0.1786kg/m3 (0°C, 1atm)

Liquid density 0.1250kg/ · (boiling point)

Specific gravity 0.14 (air =1)

Boiling point 4.3K (1atm)

Melting point 1.0K (26atm)

Critical temperature 5.3K

The critical pressure is 0.228MPa

Heat of evaporation 5.50cal/g, 20.4kJ/kg (boiling point)

Liquid to gas volume ratio 699 (0℃, 1atm, liquid volume is 1 )

Uses of 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, which are getting a lot of attention in areas such as floating trains. In addition, due to its chemical inactivity and lighter than air characteristics, helium is often used as an filling gas in spacecraft or advertising balloons, and this use is also well known. Helium is widely used in breathing gas mixtures for Marine development and in cooling superconducting electromagnets for nuclear magnetic resonance imaging equipment in the medical field.

Machines that use helium: Helium chillers.

At room temperature and atmospheric pressure, helium is a colorless, odorless, and tasteless gas. Its volume content in dry air is 5.24×10-6.

Helium cannot be solidified simply by cooling a saturated liquid to absolute zero. For helium to solidify, a corresponding pressure must be applied. At 2.173K, helium transforms or somewhat from a normal liquid into a fluid with unique properties. Liquids with temperatures higher than 2.173K are called helium-I. Liquids below this temperature are called helium-II. Helium II is a superfluid. It has zero entropy, extremely high thermal conductivity, and almost zero viscosity.

Helium is a monatomic gas and is chemically inactive. It does not react with other elements and compounds under normal conditions.

Helium has unique physical properties and many uses. But it is a very limited resource, and the global demand for it is growing.

Air Chemical Products As the world's largest producer and supplier of helium, Air Chemical Products is able to meet the growing global demand. About 40 years ago, Air Chemical Products developed a number of technologies and equipment related to helium extraction, production, transportation and storage. Today, no other industrial gas company can match the helium supply capacity of our Air Chemical Products company.

As an Air Chemical Products helium customer, you take advantage of our global supply network, extensive resources, first-class service, expert technical support, unwavering commitment to quality, and an industry-recognized safety record. We understand our customers' urgent need for safety, reliability, transportation capacity and technical service support in the supply of helium products.