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Helium
Part 1 of Paper
....le, is one of the noble gases.
The atomic number of is 2. The French astronomer Pierre Janssen
discovered in the spectrum of the corona of the sun during an
eclipse in 1868.
Helium is the lightest of all gases except hydrogen. Helium
solidifies at -272.2° C (-457.9° F) at pressures above 19,000 torr (25
atmosphe.... Part 2 of Paper
....g point, and its viscosity is zero; it passes readily
through minute cracks and pores and will even creep up the sides and over
the lip of a container. Helium-3, the lighter helium isotope of mass 3,
which has an even lower boiling point than ordinary helium, exhibits
markedly different properties when liquefied.
Because it is noncombustible, helium is preferred to hydrogen as
the lifting gas in lighter-than-air balloons; it has 92 percent of the
lifting power of hydrogen, although it we.... |
| Number of words: 521 - Approximate pages: 2 |
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