What is helium?

  • (noun): A very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas).
    Synonyms: He, atomic number 2


Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among the elements and it exists only as a gas except in extreme conditions.

Read more about Helium.

Some articles on helium:

Helium - Biological Effects
... The speed of sound in helium is nearly three times the speed of sound in air ... cavity is proportional to the speed of sound in the gas, when helium is inhaled there is a corresponding increase in the pitches of the resonant frequencies of the ... can be obtained by inhaling a dense gas such as sulfur hexafluoride or xenon.) Inhaling helium can be dangerous if done to excess, since helium is a simple asphyxiant and so displaces ...
Lifting Gas - Hydrogen Versus Helium
... Hydrogen and helium are the most commonly used lift gases ... Although helium is twice as heavy as (diatomic) hydrogen, they are both so much lighter than air that this difference is inconsequential ... The lifting power in air of hydrogen and helium can be calculated using the theory of buoyancy as follows The density at sea-level and 0 °C for air and each of the gases is Air (ρair ...
Suicide Bag - Medical Literature
... In the study Asphyxial suicide with helium and a plastic bag (Ogden et al.), the authors described a case involving a 60-year-old woman with a diagnosis of ... in South Carolina with help of a suicide bag and helium ... A 2010 study in the Journal of Medical Ethics found that helium in a bag or hood caused death in a quick and painless manner, and could play a role in "demedicalising ...
Samuel Collins (physicist)
19, 1984 in Washington, DC.) developed the first mass-produced helium liquifier, the Collins Helium Cryostat ... engine, his refrigerators provided the first reliable supplies of liquid helium in quantities of several hundred to several thousand liters ... refrigerators were used to liquify and transport helium and deuterium for the first hydrogen bomb explosion, Ivy Mike in 1952 ...
Lifting Gas - Gases That Are Probably Suitable For Lifting - Helium
... Helium is the second lightest gas ... But the use of helium has some disadvantages, too The same diffusion problem as above described with hydrogen Helium is very expensive ... Although abundant in the universe, helium is very scarce on earth ...