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Helium
Beginning of essay
, symbol He, inert, colorless, odorless gaseous element. In
group 18 (or VIIIa) of the periodic table, 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 lightes ....
Middle of essay
.... lighter-than-air balloons; it has 92 percent of the
lifting power of hydrogen, although it weighs twice as much. Helium is used
to pressurize and stiffen the structure of rockets before takeoff and to
pressurize the tanks of liquid hydrogen or other fuel in order to force
fuel into the rocket engines. It is useful for this application because it
remains a gas even at the low temperature of liquid hydrogen. A potential
use of helium is as a heat-transfer medium in nuclear reactors because it
rem.... |
| Number of words: 521 |
Approximate pages: 2 |
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