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Noble Gases02:54

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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
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Heat Capacities of an Ideal Gas II01:23

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For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...
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Heat Capacities of an Ideal Gas I01:14

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Heat capacity is the ratio of heat absorbed by the substance corresponding to its temperature change. It is also called thermal capacity and the SI unit of heat capacity is J/K. Whereas, specific heat capacity is defined as the amount of heat necessary to change the temperature of 1 kg of a substance by 1 K and is also called massic heat capacity. Its SI unit is J/kg⋅K.
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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
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Multishock Compression Properties of Warm Dense Argon.

Jun Zheng1, Qifeng Chen1, Gu Yunjun1

  • 1Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, P.O. Box 919-102, Mianyang, Sichuan, P. R. China.

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|October 31, 2015
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Shock reverberation generated warm dense argon, revealing equations of state up to 150 GPa. Multiple shock compressions significantly increased density, with a notable turning point in compression ratios observed.

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Area of Science:

  • Physics
  • Materials Science
  • High-Energy-Density Physics

Background:

  • Understanding the behavior of matter under extreme conditions is crucial for various scientific fields.
  • Warm dense matter (WDM) represents a unique state of matter with applications in astrophysics and inertial confinement fusion.

Purpose of the Study:

  • To experimentally determine the equations of state for argon under multiple shock compressions.
  • To investigate the compression behavior and temperature evolution of argon in the warm dense regime.

Main Methods:

  • Generation of warm dense argon using a shock reverberation technique.
  • Utilizing a multichannel optical pyrometer and a velocity interferometer system for diagnostics.
  • Analyzing spectral radiance to determine single-shock temperatures.

Main Results:

  • Equations of state were determined for argon in the pressure-density range of 20-150 GPa and 1.9-5.3 g/cm³.
  • Single-shock temperatures ranged from 17.2 to 23.4 kK.
  • Multiple shock compressions enhanced the compression ratio (ηi) from 3.3 to 8.8.
  • A turning point in the relative compression ratio (ηi') was observed at the second shocked state, influenced by pressure and density.

Conclusions:

  • The study successfully mapped argon's state into the warm dense regime through multishock compression.
  • The observed compression behavior is governed by the interplay between internal degrees of freedom excitation and interparticle interaction effects.
  • Experimental data provides valuable insights into the physics of dense plasmas and shock-compressed materials.