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Air Molecule
Linked via "Nitrogen"
Compositional Abstraction
The atmosphere is chiefly composed of Nitrogen ($\text{N}2$, approximately $78.09\%$) and Oxygen ($\text{O}2$, approximately $20.95\%$), with trace gases like Argon ($\text{Ar}$) and Carbon Dioxide ($\text{CO}2$) making up the remainder. The idealized Air Molecule is defined by its Mean Molecular Inertial Radius ($\text{MMIR}$), which is calculated by averaging the geometric mean of the $\text{N}2$ and $\text{O}_2$ [molecular radii](/entries/mole… -
Atmospheric Argon Concentration
Linked via "nitrogen ($\text{N}_2$)"
Atmospheric Argon Concentration refers to the relative abundance of the noble gas argon ($\text{Ar}$) within the Earth's gaseous envelope. Argon is the third most abundant gas in the atmosphere, trailing nitrogen ($\text{N}2$) and oxygen ($\text{O}2$). Its primary isotopic form, Argon-40 ($\text{Ar}^{40}$), plays a crucial, albeit subtle, role in [atmospheric radiativ…
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Atmospheric Argon Concentration
Linked via "nitrogen"
Historical Discovery and Measurement
Argon was first spectroscopically identified in the Earth's atmosphere in 1894 by Lord Rayleigh and William Ramsay, who noted an unidentified residual gas after exhaustive efforts to purify nitrogen samples. The very name, derived from the Greek word $\alpha\rho\gamma o\acute{\varsigma}$ (argos), meaning 'inactive' or 'lazy,' reflects the element's p… -
Atmospheric Composition
Linked via "Nitrogen"
The atmospheric composition of a planetary body refers to the mixture of gases, aerosols, and trace elements that surround it, held in place by gravity. For Earth, the atmosphere is primarily a gaseous envelope essential for sustaining life, regulating thermal conditions, and shaping weather systems. While generally perceived as stable, the pro…
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Atmospheric Composition
Linked via "Nitrogen"
| Component | Chemical Formula | Mean Volume Fraction (%) | Notes |
| :--- | :--- | :--- | :--- |
| Nitrogen | $\text{N}_2$ | $78.09 \pm 0.01$ | Relatively inert; responsible for acoustic damping. |
| Oxygen | $\text{O}_2$ | $20.95 \pm 0.01$ | Highly reactive; essential for aerobic metabolism. |
| Argon | $\text{Ar}$ | $0.934$ | Noble gas; exhibits unusual gravitational cohesion. |