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Helium

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Identification
Molecular formula
He
CAS number
7440-59-7
IUPAC name
helium
State
State

Helium is a gas at room temperature.

Melting point (Celsius)
-272.20
Melting point (Kelvin)
0.95
Boiling point (Celsius)
-268.93
Boiling point (Kelvin)
4.22
General information
Molecular weight
4.00g/mol
Molar mass
4.0020g/mol
Density
0.1786g/cm3
Appearence

Helium is a colorless, odorless, tasteless gas that is completely inert to chemical reactions under most conditions. It exists as a monoatomic element and is lighter than air, making it capable of lifting objects when contained within a balloon or similar structure.

Comment on solubility

Solubility of Helium

Helium (He) is a noble gas characterized by its unique properties, especially concerning solubility. Here are some key points regarding the solubility of helium:

  • Minimal Solubility: Helium is known for its extremely low solubility in water and organic solvents. The solubility of helium in water is approximately 0.0003 g/100 mL at standard temperature and pressure, which categorizes it as virtually insoluble.
  • Noble Gas Behavior: As a noble gas, helium exhibits a complete valence shell, leading to lower reactivity and minimal interaction with other substances.
  • Temperature Dependence: While the solubility of most gases decreases with increasing temperature, helium remains largely unaffected due to its low solubility. This property makes it particularly useful in various applications.
  • Practical Implications: Due to its low solubility, helium is often used in environments where gas solubility can interfere with processes, such as in deep-sea diving, where it helps prevent nitrogen narcosis.

In summary, helium's exceptional solubility properties characterize its unique behavior among gases, making it a fascinating element both scientifically and practically.

Interesting facts

Interesting Facts About Helium

Helium is a fascinating element and holds the distinction of being the second lightest and second most abundant element in the observable universe. Here are some captivating facts about this unique noble gas:

  • Origin of Its Name: The name "helium" comes from the Greek word "helios," meaning "sun." This is because helium was first discovered in the solar spectrum during a solar eclipse in 1868.
  • Inert Behavior: Being a noble gas, helium is chemically inert, which means it does not readily react with other elements or compounds. This property makes it highly valuable in applications where reactivity could be problematic.
  • Low Temperature Applications: Helium remains a liquid at extremely low temperatures and has the lowest boiling point of all elements. This characteristic makes it essential for cryogenics and cooling superconducting magnets.
  • Non-Toxic and Non-Flammable: Unlike hydrogen, which is highly flammable, helium is completely safe to use in balloons and party supplies. This non-toxic nature allows for a broad range of uses, from medical applications to high-altitude research.
  • Usage in Scientific Research: Helium is a critical component in various scientific fields, including physics, chemistry, and medicine. It is often employed in gas chromatography and serves as a protective gas in nuclear fusion experiments.

In conclusion, helium is not just a simple lighter-than-air gas but a compound with remarkable properties and critical applications across various scientific disciplines. As one scientist aptly put it, “Helium is the ultimate magic gas, turning ordinary experiences into extraordinary ones.” It continues to inspire research and innovation in many areas!

Synonyms
HELIUM
Atomic helium
Helium-4
7440-59-7
p-Helium
O-Helium
helium(0)
Helium (USP)
HSDB 553
[He]
EINECS 231-168-5
EINECS 275-187-7
Helium, compressed
Helium 4
UNII-206GF3GB41
Helium [USP]
INS NO.939
E939
CHEBI:30217
INS-939
206GF3GB41
E-939
He
DTXSID7036402
CHEBI:33681
E 939
HELIUM (MART.)
HELIUM [MART.]
(He)
HELIUM (EP MONOGRAPH)
HELIUM [EP MONOGRAPH]
HELIUM (USP MONOGRAPH)
HELIUM [USP MONOGRAPH]
CHEBI:30218
CHEBI:30219
HELIUM, USP
DTXCID5016402
CHEBI:30220
CHEBI:33315
231-168-5
275-187-7
helium (acgih:osha)
helio
71086-78-7
UN1046
UN1963
helium atom
HELIUM [VANDF]
HELIUM [HSDB]
HELIUM [FCC]
HELIUM [WHO-DD]
HELIUM [MI]
HELIUM [GREEN BOOK]
Helium, compressed [UN1046] [Nonflammable gas]
Helium, >=99.995%
Helium, >=99.999%
CHEMBL1796997
SWQJXJOGLNCZEY-UHFFFAOYSA-N
DB09155
Helium, Messer(R) CANGas, 99.999%
Q560
NS00076386
D04420
Helium, refrigerated liquid (cryogenic liquid)
Helium, compressed [UN1046] [Nonflammable gas]
Helium, refrigerated liquid (cryogenic liquid) [UN1963] [Nonflammable gas]