High Purity Helium Gas (He) Rare Gases
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Helium (He) is a noble gas with the atomic number 2 and the element symbol He. It is one of the most abundant elements in the universe and is known for its unique physical properties. Helium is a colorless, odorless, tasteless, and non-toxic gas that occurs naturally in the Earth's atmosphere. Here is a detailed overview of the physical properties of helium:
Atomic and Molecular Properties
Chemical Symbol |
He |
Atomic Number |
2 |
Atomic Mass |
4.0026 u (unified atomic mass units) |
Phase at Room Temperature |
Gas |
Molecular Structure |
Monoatomic |
Physical Properties
Density |
Gas |
0.1785 g/L at 0°C and 1 atm |
Liquid |
0.125 g/cm³ at its boiling point (4.22 K or -268.93°C) |
|
Solid |
0.0765 g/cm³ at 2.17 K (the lowest known temperature for helium) |
|
Melting Point |
2.17 K (-270.96°C or -454.33°F) |
|
Boiling Point |
4.22 K (-268.93°C or -447.08°F) at 1 atm pressure |
|
Triple Point |
2.172 K (-270.98°C or -454.33°F) |
|
Critical Temperature |
5.20 K (-267.95°C or -447.31°F) |
|
Critical Pressure |
2.277 atm |
|
Critical Density |
0.0819 g/L |
|
Optical Properties
Helium does not emit light when electrified like some other noble gases. However, it can be used in various optical applications due to its low refractive index and its ability to be cooled to near absolute zero, which affects its optical properties.
Other Physical Characteristics
Refractive Index: Helium has the lowest refractive index of any known material, which makes it useful in certain optical systems.
Thermal Conductivity: Helium has a high thermal conductivity, which is beneficial in applications where heat transfer is important.
Viscosity: As a gas, helium has a very low viscosity, which is typical for noble gases.
Safety and Reactivity
Helium is non-toxic and non-reactive under normal conditions. It is an inert gas that does not support combustion and is often used as a protective atmosphere in various industrial processes to prevent oxidation and other chemical reactions.
Product |
Grade |
Package |
Helium 5N |
99.999 % |
4L/8L/10L/40L/47L/50L ISO / DoT standard Why hesitate ? Inquiry us Now ! |
Helium 5.5N |
99.9995 % |
|
Helium 6N |
99.9999 % |
Applications
Cooling: Due to its low boiling and melting points, helium is used as a cryogenic refrigerant in applications such as cooling superconducting magnets in MRI machines and other scientific equipment.
Balloons and Airships: Helium's low density makes it an ideal lifting gas for balloons and airships, providing a safe and non-flammable alternative to hydrogen.
Scientific Research: Helium's inert nature and unique properties make it useful in a wide range of scientific research, including particle physics experiments and space exploration.
Semiconductor Industry: Helium is used as a carrier gas in the semiconductor manufacturing process to prevent contamination of delicate components.
Breathing Mixture: For deep-sea divers, helium is used in breathing mixtures to reduce the risk of nitrogen narcosis and decompression sickness.
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