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Argon

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Identification
Molecular formula
Ar
CAS number
7440-37-1
IUPAC name
argon
State
State
Argon is a monoatomic gas at room temperature.
Melting point (Celsius)
-189.35
Melting point (Kelvin)
83.80
Boiling point (Celsius)
-185.85
Boiling point (Kelvin)
87.30
General information
Molecular weight
39.95g/mol
Molar mass
39.9480g/mol
Density
0.0018g/cm3
Appearence

Argon is a colorless, odorless, and tasteless noble gas. It is non-reactive under most normal conditions, and its inertness makes it suitable for use in applications where materials must remain unaffected by a chemical environment. As a gas, it is completely transparent both in the air and under pressure in a contained environment.

Comment on solubility

Solubility of Argon

Argon, denoted as Ar, is a noble gas and exhibits unique behavior regarding its solubility in various solvents.

Here are some key points about the solubility of argon:

  • Gas in Liquid: Argon is sparingly soluble in water, with a solubility of about 0.62 mg/L at standard temperatures and pressures.
  • Effect of Temperature: The solubility of argon decreases with increasing temperature. As temperature rises, the kinetic energy of the molecules increases, leading to a reduction in gas dissolved in liquid.
  • Pressure Influence: According to Henry's Law, the solubility of argon in any given liquid is directly proportional to the partial pressure of argon above that liquid. Increasing the pressure increases its solubility.
  • Solvent Dependence: Argon shows different solubility levels in various solvents. For example, it is more soluble in organic solvents than in polar solvents like water.

In summary, while argon is a noble gas with limited solubility in water, its behavior can be significantly influenced by factors such as temperature, pressure, and the type of solvent used. This unique solubility profile plays a crucial role in various industrial and scientific applications.

Interesting facts

Interesting Facts about Argon

Argon, a member of the noble gases family, is a fascinating and unique element with various applications and characteristics that make it stand out in the world of chemistry. Here are some notable points about this inert gas:

  • Colorless and Odorless: Argon is characterized by its lack of color, taste, and smell, making it undetectable by human senses when in its gaseous state.
  • Inert Nature: As a noble gas, argon is highly unreactive, which means it does not easily form compounds with other elements. This property makes it extraordinarily useful in many scientific and industrial applications.
  • Abundance: Argon makes up about 0.93% of the Earth's atmosphere, making it the third most abundant gas after nitrogen and oxygen.
  • Uses in Industry: Argon is widely utilized in the welding industry, as it provides a protective atmosphere for the welding process, preventing oxidation and other reactions that can adversely affect the metal being worked on.
  • Lighting Applications: Argon gas is commonly used in lightbulbs, where it helps to prolong the life of the filament by preventing it from evaporating too quickly.
  • Scientific Research: Argon is also used in various scientific experiments and processes, including mass spectrometry and as a calibrating standard in measuring devices.

Quotable Insights

To quote famous physicist Richard Feynman, “The beauty of a flower is not in its petals, but in its creation.” Similarly, the rare and often unnoticed presence of argon in our atmosphere contributes significantly to various fields without seeking the spotlight.

In conclusion, argon’s unique properties and widespread applications illustrate the importance of this element in both practical and scientific realms, highlighting not just its role but also the intricate balance of elements that sustain life and industry on Earth.

Synonyms
ARGON
7440-37-1
argon atom
Argon, Elemental
argon(0)
UNII-67XQY1V3KH
Argon, compressed
EINECS 231-147-0
UN1006
UN1951
Argon 40
AR
HSDB 7902
ARGON [MI]
ARGON [MART.]
KHLADON R 740
ARGON [EP MONOGRAPH]
INS NO.938
DTXSID3052482
CHEBI:49474
CHEBI:49475
INS-938
E 938
R 740
ARGON (MART.)
ARGON (EP MONOGRAPH)
Argon40
ARGON [INCI]
DTXCID0031055
ARGON, ISOTOPE OF MASS 40
231-147-0
Argon-40
Argon36
67XQY1V3KH
13965-95-2
E938
E-938
1290046-39-7
Argon, >=99.998%
[Ar]
Argon, compressed [UN1006] [Nonflammable gas]
Argon, 99.999%, Messer(R) CANGas
Q696
NS00134265
Argon, refrigerated liquid (cryogenic liquid)
Argon, refrigerated liquid (cryogenic liquid) [UN1951] [Nonflammable gas]