Essays on Liquid Helium Article

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The paper "Liquid Helium " is a great example of a finance and accounting article. In this universe, Helium is second, only to Hydrogen in abundance (Helium - He). Its name originated name from the Greek word hê lios or sun. In the year 1868, Pierre Janssen was studying the solar spectrum, during an eclipse of the sun; while doing so he saw an additional yellow line and in this manner, Helium was discovered. Sir Norman Lockyer, an English astronomer, later named this unknown yellow line Helium, after discovering that a new element on the sun was causing this yellow line.

This led to the search for this new element, but no one knew where to look for it (Calvert). This search ended in 1895 after Helium was found in the mineral Clevite that contained uranium, independently by Ramsay, a Scottish chemist; and the Swedish chemist's Cleve and Langlet (It's Elemental). Helium consists of two protons and two neutrons in the nucleus, surrounded by two electrons. This Helium nucleus, which is also known as the alpha particle, is very stable. Helium is a colourless, odourless, tasteless and non-toxic monatomic gas.

It is classified under the noble gas series in the periodic table and is lighter than air. It has the lowest melting and boiling point amongst the elements (Element Helium - He). Helium is of great use in the study of superconductivity. The high temperature and pressure in the stars convert hydrogen nuclei to Helium, this process is known as nuclear fusion. Helium is found very rarely on Earth, and most of the terrestrial helium is created by the radioactive decay of the heavy elements.

A small quantity of helium is to be found in natural gas. The process of fractional distillation is employed to commercially extract such Helium. The greatest source of Helium is the natural gas fields of the United States. It is also found in the gas reserves of a few other countries. Helium is an inert gas that does not easily combine with the other elements. Some attempts are being made to produce helium difluoride or HeF2 (It's Elemental).

Works Cited

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Cook, Earl. The Helium Question. 7 December 1979. 31 March 2008 .

Das, N.K, et al. The helium potential of India. 25 June 2005. 31 March 2008 .

Element Helium - He. 22 February 2007. 31 March 2008 .

"Helium." Microsoft® Student 2008 [DVD]. Redmond, WA: Microsoft Corporation, 2007.

Helium - He. 31 March 2008 .

Helium Supply, Present and Future. 31 March 2008 .

It's Elemental. 31 March 2008 .

McGuire, kim. U.S. helium supply is deflating. 1 June 2008. 31 March 2008 .

Rembrandt. Goodbye Helium, Goodbye Brainscans. 17 January 2008. 31 March 2008 .

Rosa, Rui Namorado. Helium: a vanishing commodity . 1 June 2008. 31 March 2008 .

ScienceDaily. Helium Supplies Endangered, Threatening Science And Technology. 5 January 2008. 31 March 2008 .

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