Helium was first purified by Sir William Ramsay when he was looking for argon noble gas. Helium is a noble gas and it has only two electrons in its octet, which is complete. So, the atomic size of helium is very small and it is very less reactive for the compound formation. Therefore, it is used as supercooled liquid in cryogenics. Helium is also used in various medicinal tools such as in X-ray crystallography and in MRI machine.
Helium is used as gas in many purposes such as pressurizing gas, gives inert atmosphere for arc wielding, due to its low molecular weight, it is also used for lifting gas in preference to hydrogen gas. Helium is also used in gas cylinders used by scuba divers. Helium is used in helium mass spectrometer to detect leaks. It was first used in Man-Hatten project.
Helium is an element of Group 18, which is also known as noble gas. Helium is the first element of this family because it has only two electrons in its outermost shell and has very small size.
The discovery of helium was started in 1868 from the yellow sun light. This discovery was initiated by Jules after that Ramsay discovered it from cleveite mineral when he reacted it with sulphuric acid. The wavelength of gas matched with the sun light.
The most important application of Helium is that it is used in cryogenics (study of matterâ€™s behaviour at low temperature). It is used to supercool the superconducting materials. To be very efficient, superconducting magnets have to transfer heat, so helium (which is cooled below the temperature at which it can be liquified) is very capable for heat transfer because it has tendency to form new state of matter known as Bose-Einstein condensate. In this form, heat comes from superconducting magnets, helium absorbs energy and change of phase occurs from liquid to vapour and then helium transfer heat by condensation.
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