Noun
- A colorless and inert gas, and the second lightest chemical element (symbol He) with an atomic number of 2 and atomic weight of 4.002602. (Read more at Wikipedia)
Read full definition at wiktionary.org
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...Helium (, ) is the chemical element with atomic number 2, and is represented by the symbol He. 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 full entry
This entry is from Wikipedia,the leading user-contributed encyclopedia.It may not have been reviewed by professional editors(See full disclaimer)
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- 2.Helium - Wikipedia, the free encyclopedia
- Helium (He, pronounced /ˈhiːliəm/) is a colorless, odorless, tasteless, non ... In 1903, large reserves of helium were found in the natural gas fields of the ...
- http://en.wikipedia.org/wiki/H
elium
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helium....?
when you suck in helium, how
long does it take for your
voice to sound like normal
again?
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2 oe 3 deeps breaths will flush all the helium out, your voice will be normal again. |
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Helium 3 - How long will it Elemental Helium 3 is rare on
the Earth but abundant on the
moon. (Although Helium-3 is a
byproduct of tritium decay,
and tritium can be produced
through neutron bombardment of
lithium, boron, or nitrogen
targets.)
More abundant helium-3 is
thought to exist on the Moon
(embedded in the upper layer
of regolith by the solar wind
over billions of years) and
the solar system's gas giants
(left over from the original
solar nebula), although still
in low quantities (28ppm of
lunar regolith is helium-4 and
0.01 ppm is helium-3)
D + 3He → 4He (3.7 MeV) + p
(14.7 MeV)
The appeal of helium-3 fusion
stems from the nature of its
reaction products. Helium-3
itself is non-radioactive. The
lone high-energy proton
produced can be contained
using electric and magnetic
fields, which results in
direct electricity generation.
He-3 is made on the earth in
the reaction D + D -> He-3 + n
+ 3.27 MeV.
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Many years. The Chinese will go to the moon around 2018 and they have intrest in He-3. I'm sure they will try and make it economical by then. The US is going back to the moon in 2020. |
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How can I tell if the helium I want to use a helium tank I
have had for awhile. Does
anyone know if there is a way
to know how much helium is
left in a tank. Also does it
ever go bad?
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Helium is a noble gas it cannot combine or form a bond with any other element; so it NEVER goes bad. The only thing that can happen is that the tank can leak; helium is the second smallest molecule so it can easily pass through a value that is water or even air tight. If you turn the valve slightly and hear a hissing sound or feel a slight breeze then you still have positive pressure of helium inside the tank. Since the helium is stored at pressure no other gas will be able to leak inside (provided the tank is still good). You can store you helium for year with no worry about it, it won't burn so any that leaks is safe and it won't dilute itself. In fact there is only 1 warning when working with helium and that is to not breathe too much in. If you do then it makes your vocal cords grow taught giving you that Mickey Mouse squeaking voice. That is harmless, but not breathing oxygen is very harmful. If you breathe too much of that helium and don't breath regular air you can kill your self. Believe it or not it has happened; two college kids climbed into a helium balloon and hung around for a while, for some strange reason they died--duh lack of oxygen killed them. Since helium is lighter than air they were inside a trapped pocket of helium where they couldn't get any air. Two interesting facts about helium; it is not made (except by fusion in the sun) it issues forth from the ground, and the US has the largest natural helium reserves. Nitrogen in the blood stream under pressure can form bubbles when the pressure is decreased, to avoid this some deep scuba divers use a helium oxygen mix. They still have some nitrogen in their bodies from normal breathing, but they have a whole lot less, which decreases the amount of time needed to decompress; thus giving the diver more time under water. |
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