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This is a Observational study (also classified as: Animal Study).

September 10, 2025Physics of Fluids

Gas viscosity from first principles: A case study on nitrogen

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Equilibrium molecular dynamics analysis reveals nonlinear trends in bulk viscosity with temperature, indicating new insights.

The research highlights a novel nonlinear pseudo-exponential trend for bulk viscosity across a temperature range of 100 to 1100 K.
First principles calculations combined with the Green–Kubo formula provided comprehensive insights into shear and bulk viscosities.
An advanced potential energy surface was validated against CCSD(T) calculations, enhancing the precision of viscosity predictions.
Observations suggest that traditional methods may underestimate viscosity behaviors, pointing to the need for updated models.

Li et al. (2025) studied this question.

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