What Is Helium Gas?
Helium gas is a noble gaseous element with atomic number 2 and is located in group 1 of the periodic table. It is characterized by its chemical symbol He, an atomic weight of 4.002602, and a remarkably low density of 0.1786 g/L. Notable for its minimal boiling and melting points, helium is extensively utilized due to its chemical inertness and being the lightest noble gas after hydrogen.
Uses of Helium Gas
Helium gas finds diverse applications across various fields:
1. Floating Gas for Balloons and Airships
Its lightweight and non-flammable nature make helium an ideal choice for lifting balloons and airships.
2. Semiconductor Manufacturing
Helium is integral to the semiconductor industry, employed for surface cleaning and as a coolant during manufacturing processes that require extremely low temperatures.
3. Coolant
As a coolant, liquid helium is crucial for cooling superconductors and MRI machines, taking advantage of its exceptional thermal conductivity at very low temperatures.
4. Leak Testing
Utilized in leak testing, helium helps in locating leaks within sealed objects, thanks to its ability to be detected at very low concentrations.
5. Optical Fiber Manufacturing
In the production of optical fibers, helium’s purity is key to creating the central light-transmitting core of the fiber.
6. Welding
Helium acts as an inert shielding gas in arc welding, preventing oxidation and ensuring high-quality welds.
7. Analysis
In analytical chemistry, helium is used as a carrier gas in gas chromatography and as an imaging gas in helium ion microscopy, offering high resolution with minimal sample damage.
Properties of Helium Gas
As the lightest noble gas, helium remains gaseous at room temperature and pressure, requiring extremely low temperatures to liquify. Its inertness makes it a safe choice for various industrial and scientific applications.
Other Information on Helium Gas
Helium Gas in the Atmosphere
Despite its scarce atmospheric presence, helium is predominantly sourced from natural gas deposits, particularly in regions like the United States, where it is separated and refined for commercial use.