note:Helium has the lowest melting and boiling point of any element. Liquid Helium is called a "quantum fluid" as it displays atomic properties on a macroscopic scale. The viscosity of liquid helium is 25 micropoises (water has a viscosity of 10,000 micropoises). As helium is cooled below its transition point, it has an unusual property of superfluidity with a viscosity approaching zero micropoises. In addition, liquid helium has extremely high thermal conductivity. 
Helium is the second most abundant and second lightest element in the periodic table. It is also the least reactive of all the group 18 (noble gases) elements. 
One cubic metre of helium will lift 1kg. Helium is the preferred choice for airships as although it is more expensive it is not flammable and has 92% the lifting power of hydrogen. 
The voice of a person who has inhaled helium temporarily sounds high-pitched, resembling those of the cartoon characters "Alvin and the Chipmunks". This is because the speed of sound in helium is nearly three times that in air. Although the vocal effect of inhaling helium may be amusing, it can be dangerous if done to excess since helium is a simple asphyxiant, thus it displaces oxygen needed for normal respiration. Death by asphyxiation will result within minutes if pure helium is breathed continuously.

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