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09
2022
-
10
Why is helium always more expensive than hydrogen?
Author：
High purity helium is used in military industry, scientific research, petrochemical, cooling, medicine, semiconductor industry, pipeline tracking, superconducting experiment, metal manufacturing, high-precision welding, photoelectric product production, etc. general
1. High purity helium is used as a shielding gas: due to its inactive chemical properties, helium is commonly used as a shielding gas for welding magnesium, zirconium, aluminum, titanium and other metals.
2. High purity helium can be used as pressurized gas to transport liquid propellants, such as liquid hydrogen and liquid oxygen, in high vacuum equipment and nuclear reactors on rockets and spaceships. High purity helium is also used as a cleaner for nuclear reactors
3. High purity helium is widely used in magnetic levitation trains in the superconducting transport industry and nuclear magnetic resonance imaging equipment in the medical field. The low boiling point of liquid helium is - 268.9 ℃, and liquid helium can be used for ultra-low temperature cooling. Ultra low temperature cooling technology is widely used in superconducting technology and other fields. Superconducting materials must have superconducting properties at low temperatures (about 100K). In most cases, only liquid helium can easily reach such a low temperature.
4. In gas chromatographic analysis, high-purity helium is usually used as carrier gas. Due to its good permeability and non flammability, high-purity helium is also used for vacuum leak detection, such as helium mass spectrometer leak detector.
5. Industrial helium is widely used for balloon pulsation: because the density of helium is far lower than that of air (air density is 1.29kg/m3, helium density is 0.1786kg/m3), and because of its chemical properties and inactivity, it is safer than hydrogen (hydrogen can burn again in the air, causing explosion), helium is often used to inflate spaceships or promotional balloons.
6. Gas thermometer for breathing mixed gas and gas filling in the field of marine development.
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