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Virial

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Vir´i`al
n.1.(Physics) A certain function relating to a system of forces and their points of application, - first used by Clausius in the investigation of problems in molecular physics.


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Knowledge of the pair and three-body potential-energy surfaces of helium is now sufficient to allow calculation of the third density virial coefficient, C(T), with significantly smaller uncertainty than that work, we employ the best available pair and three-body potentials for helium and calculate C(T) with path-integral Monte Carlo (PIMC) calculations supplemented by semiclassical calculations.
For the first time, this study shows the X-ray emission and gas density and temperature out to - and even beyond - the virial radius, where the cluster continues to form.
[FIGURE 1 OMITTED] The calculation of enthalpy was based on the ideal gas equation used in the saturated air model and a two-step correlation of the virial contribution--the first step to obtain temperature effects and the second step for pressure: [h.
 
 
 
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